Missile Attacks Off Yemen and the Iran- Saudi Proxy War for Oil Shipping Chokepoints

Some party to the Yemen "civil war" has been shooting missiles at ships off the Yemeni coast, including unsuccessfully firing a couple at U.S. Navy warships operating off that coast, as reported at Missiles fired from rebel-held Yemen land near Norfolk-based USS Mason and an earlier attack on a former USNS leased vessel, as reported at Former U.S. Navy HSV-2 Swift wrecked in Yemen missile attack.

Why would the "rebels" be doing this?

The "civil war" in Yemen is widely viewed as a Saudi v. Iran proxy war with the U.S. on the side of the Saudis, making it a Iran v.U.S. Proxy war.

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Things are pretty much a mess in Yemen as various Shiite and Sunni groups attempt to push the others around in order to gain control of key areas of Yemen. Pretty good explanation from the BBC of Yemen crisis: Who is fighting whom?:

The main fight is between forces loyal to the beleaguered President, Abdrabbuh Mansour Hadi, and those allied to Zaidi Shia rebels known as Houthis, who forced Mr Hadi to flee the capital Sanaa in February. {2015}
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Yemen's security forces have split loyalties, with some units backing Mr Hadi, and others the Houthis and Mr Hadi's predecessor Ali Abdullah Saleh, who has remained politically influential. Mr Hadi is also supported in the predominantly Sunni south of the country by militia known as Popular Resistance Committees and local tribesmen.
Both President Hadi and the Houthis are opposed by al-Qaeda in the Arabian Peninsula (AQAP), which has staged numerous deadly attacks from its strongholds in the south and south-east.
The picture is further complicated by the emergence in late 2014 of a Yemen affiliate of the jihadist group Islamic State, which seeks to eclipse AQAP and claims it carried out a series of suicide bombings in Sanaa in March 2015.
After rebel forces closed in on the president's southern stronghold of Aden in late March, a coalition led by Saudi Arabia responded to a request by Mr Hadi to intervene and launched air strikes on Houthi targets. The coalition comprises five Gulf Arab states and Jordan, Egypt, Morocco and Sudan.
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The conflict between the Houthis and the elected government is also seen as part of a regional power struggle between Shia-ruled Iran and Sunni-ruled Saudi Arabia, which shares a long border with Yemen.
Gulf Arab states have accused Iran of backing the Houthis financially and militarily, though Iran has denied this, and they are themselves backers of President Hadi.
Yemen is strategically important because it sits on the Bab al-Mandab strait, a narrow waterway linking the Red Sea with the Gulf of Aden, through which much of the world's oil shipments pass. Egypt and Saudi Arabia fear a Houthi takeover would threaten free passage through the strait.

If you feel you need a scorecard to keep track, you are not alone.

But focus on this - Iran is Saudi Arabia's enemy.

Iran would like to control the Saudi outflow of oil. It can do so by shutting down Saudi access through the Strait of Hormuz except that the Saudi's can also export oil from their west coast on the Red Sea and ship it through the Bab el-Mandeb Strait. If the Iranian surrogate Houthis can gain control of the Bab el-Mandeb Strait then Iran could, effectively, throttle Saudi oil flow.

The chokepoint situation had been discussed here many time, but the U.S.Energy Information Administration has a great site, World Oil Transit Chokepoints which lays these routes out well:

World chokepoints for maritime transit of oil are a critical part of global energy security. About 63% of the world's oil production moves on maritime routes. The Strait of Hormuz and the Strait of Malacca are the world's most important strategic chokepoints by volume of oil transit.
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The Strait of Hormuz is the world's most important chokepoint with an oil flow of

17 million barrels per day in 2013, about 30% of all seaborne-traded oil.

Located between Oman and Iran, the Strait of Hormuz connects the Persian Gulf with the Gulf of Oman and the Arabian Sea. The Strait of Hormuz is the world's most important oil chokepoint because of its daily oil flow of 17 million barrels per day in 2013. Flows through the Strait of Hormuz in 2013 were about 30% of all seaborne-traded oil.

EIA estimates that more than 85% of the crude oil that moved through this chokepoint went to Asian markets, based on data from Lloyd's List Intelligence tanker tracking service.6 Japan, India, South Korea, and China are the largest destinations for oil moving through the Strait of Hormuz.
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At its narrowest point, the Strait of Hormuz is 21 miles wide, but the width of the shipping lane in either direction is only two miles wide, separated by a two-mile buffer zone. The Strait of Hormuz is deep and wide enough to handle the world's largest crude oil tankers, with about two-thirds of oil shipments carried by tankers in excess of 150,000 deadweight tons.
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Pipelines available as bypass options
Most potential options to bypass Hormuz are currently not operational. Only Saudi Arabia and the United Arab Emirates (UAE) presently have pipelines able to ship crude oil outside of the Persian Gulf and have additional pipeline capacity to circumvent the Strait of Hormuz. At the end of 2013, the total available unused pipeline capacity from the two countries combined was approximately 4.3 million bbl/d (see Table 2).

Saudi Arabia has the 746-mile Petroline, also known as the East-West Pipeline, which runs across Saudi Arabia from its Abqaiq complex to the Red Sea. The Petroline system consists of two pipelines with a total nameplate (installed) capacity of about 4.8 million bbl/d. The 56-inch pipeline has a nameplate capacity of 3 million bbl/d, and its current throughput is about 2 million bbl/d. The 48-inch pipeline had been operating in recent years as a natural gas pipeline, but Saudi Arabia converted it back to an oil pipeline. The switch increased Saudi Arabia's spare oil pipeline capacity to bypass the Strait of Hormuz from 1 million bbl/d to 2.8 million bbl/d, but this is only achievable if the system operates at its full nameplate capacity.

Saudi Arabia also operates the Abqaiq-Yanbu natural gas liquids pipeline, which has a capacity of 290,000 bbl/d. However, this pipeline is currently running at capacity and cannot move any additional oil.

The UAE operates the Abu Dhabi Crude Oil Pipeline (1.5 million bbl/d) that runs from Habshan, a collection point for Abu Dhabi's onshore oil fields, to the port of Fujairah on the Gulf of Oman, allowing crude oil shipments to circumvent the Strait of Hormuz. The pipeline can transport more than half of UAE's total net oil exports. The government plans to increase this capacity in the near future to 1.8 million bbl/d.
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Suez Canal
The Suez Canal is located in Egypt and connects the Red Sea and Gulf of Suez with the Mediterranean Sea. In 2013, total petroleum and other liquids (crude oil and refined products) and LNG accounted for 20% and 3% of total Suez cargoes, measured by cargo tonnage, respectively. The Suez Canal is unable to handle Ultra Large Crude Carriers (ULCC) and fully laden Very Large Crude Carriers (VLCC) class crude oil tankers. The Suezmax was the largest ship capable of navigating through the canal until 2010 when the Suez Canal Authority extended the canal depth to 66 feet to allow more than 60% of all tankers to use the Suez Canal, according to the Suez Canal Authority.15

In 2013, nearly 3.2 million bbl/d of total oil (crude oil and refined products) transited the Suez Canal in both directions, according to the Suez Canal Authority. This is the largest amount ever shipped through the Suez Canal. The majority of the oil was sent northbound (1.9 million bbl/d) toward European and North American markets, and the remainder was sent southbound (1.3 million bbl/d), mainly toward Asian markets.

Oil exports from Persian Gulf countries (Saudi Arabia, Iraq, Kuwait, United Arab Emirates, Iran, Oman, Qatar, and Bahrain) accounted for 79% of Suez Canal northbound oil flows. The largest importers of northbound oil flows through the Suez Canal in 2013 were European countries (68%) and the United States (16%). Oil exports from European countries made up the majority (66%) of Suez southbound oil flows, followed by North Africa (Algeria and Libya combined made up 16%). The largest importers of Suez southbound oil flows through the Suez Canal were Asian countries (74%).

Total traffic through the Suez Canal fell in 2009, and total oil flows dropped to 1.8 million bbl/d, their lowest level in recent years. The decrease in oil flows during that time reflected the collapse in world oil market demand that began in the fourth quarter of 2008, followed by OPEC production cuts (primarily from the Persian Gulf), which caused a sharp fall in regional oil trade starting in early 2009. Egypt's 2011 revolution did not have any noticeable effect on oil transit flows through the Suez Canal. Over the past few years, oil flows through the Suez Canal have increased, recovering from previous lower levels during the global economic downturn.

SUMED Pipeline

The 200-mile long SUMED Pipeline, or Suez-Mediterranean Pipeline, transports crude oil through Egypt from the Red Sea to the Mediterranean Sea. The crude oil flows through two parallel pipelines that are 42 inches in diameter, with a total pipeline capacity of 2.34 million bbl/d. Oil flows north starting at the Ain Sukhna terminal along the Red Sea coast to its end point at the Sidi Kerir terminal on the Mediterranean Sea. SUMED is owned by the Arab Petroleum Pipeline Co., a joint venture between the Egyptian General Petroleum Corporation (50%), Saudi Aramco (15%), Abu Dhabi's International Petroleum Investment Company (15%), multiple Kuwaiti companies (15%), and Qatar Petroleum (5%).16

The SUMED Pipeline is the only alternative route to transport crude oil from the Red Sea to the Mediterranean Sea if ships were unable to navigate through the Suez Canal. Closure of the Suez Canal and the SUMED Pipeline would necessitate diverting oil tankers around the southern tip of Africa, the Cape of Good Hope, adding approximately 2,700 miles to transit from Saudi Arabia to the United States, increasing both costs and shipping time, according to the U.S. Department of Transportation.17 According to the International Energy Agency (IEA), shipping around Africa would add 15 days of transit to Europe and 8-10 days to the United States.18

Fully laden VLCCs going toward the Suez Canal also use the SUMED Pipeline for lightering. Lightering occurs when a vessel needs to reduce its weight and draft by offloading cargo to enter a restrictive waterway, such as a canal. The Suez Canal is not deep enough for a fully-laden VLCC and, therefore, a portion of the crude is offloaded at the SUMED Pipeline at the Ain Sukhna terminal. The now partially-laden VLCC goes through the Suez Canal and picks up the offloaded crude at the other end of the pipeline at the Sidi Kerir terminal.

In 2013, 1.4 million bbl/d of crude oil was transported through the SUMED Pipeline to the Mediterranean Sea, which was then loaded onto a tanker for seaborne trade. SUMED crude flows decreased over the past few years, but the decrease has been offset by more oil transiting northbound via the Suez Canal. Total oil flows via SUMED and the Suez Canal were 4.6 million bbl/d in 2013, 0.1 million bbl/d higher compared with the previous year. Total oil flows via the Suez Canal and SUMED pipeline accounted for about 8% of total seaborne-traded oil in 2013.
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Bab el-Mandeb

Closing the Bab el-Mandeb Strait could keep tankers in the Persian Gulf from reaching

the Suez Canal and the SUMED Pipeline, diverting them around the southern tip of Africa.

The Bab el-Mandeb Strait is a chokepoint between the Horn of Africa and the Middle East, and it is a strategic link between the Mediterranean Sea and the Indian Ocean. The strait is located between Yemen, Djibouti, and Eritrea, and connects the Red Sea with the Gulf of Aden and the Arabian Sea. Most exports from the Persian Gulf that transit the Suez Canal and SUMED Pipeline also pass through Bab el-Mandeb.

An estimated 3.8 million bbl/d of crude oil and refined petroleum products flowed through this waterway in 2013 toward Europe, the United States, and Asia, an increase from 2.9 million bbl/d in 2009. Oil shipped through the strait decreased by almost one-third in 2009 because of the global economic downturn and the decline in northbound oil shipments to Europe. Northbound oil shipments increased through Bab el-Mandeb Strait in 2013, and more than half of the traffic, about 2.1 million bbl/d, moved northbound to the Suez Canal and SUMED Pipeline.

The Bab el-Mandeb Strait is 18 miles wide at its narrowest point, limiting tanker traffic to two 2-mile-wide channels for inbound and outbound shipments. Closure of the Bab el-Mandeb could keep tankers from the Persian Gulf from reaching the Suez Canal or SUMED Pipeline, diverting them around the southern tip of Africa, adding to transit time and cost. In addition, European and North African southbound oil flows could no longer take the most direct route to Asian markets via the Suez Canal and Bab el-Mandeb.

So, it's all about the oil. If Iran can control oil flowing out of the Middle East, it can control prices and, I assume it believes, the behavior of those nations dependent upon that oil.

You know, world domination.

And that's why Yemen.

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