China became the first foreign buyer of the S-400 when it signed a contract in late 2014, and the first two ships carrying S-400 components from Russia arrived in China at the beginning of April 2018.
According to the Tass report, cited by The Diplomat, a third and final ship carrying support equipment arrived in May 2018.
"The ship has brought the equipment not damaged during a storm in the English Channel and the damaged equipment after repairs," the source said, referring to what a Russian military spokeswoman described as secondary components that were returned to Russia after the storm.
The arrival of all three ships brings a full regimental set of the S-400 system to China, including command centers, launchers, guided missiles, and power-supply equipment. Russian personnel are to start handing the equipment over to China at the end of May 2018 — a process expected to take two months, according to Tass.
(Russian Ministry of Defense photo)
An S-400 regiment consists of two battalions, and each battalion, also referred to as a division, has two batteries, according to The Diplomat. A standard battery has four transporter erector launchers — each with four launch tubes — as well as fire-control radar systems and a command module.
Some reports indicate that China purchased four to six S-400 regimental sets, though the Tass report said Beijing is only getting two.
While the S-400 has not been used in combat conditions, it has been heralded as one of the best air-defense systems in the world. The deployment of a second division to Crimea in early 2018, worried US military officials, who said it could give Russia more coverage of the Black Sea and was a sign of Moscow's willingness to use force.
In addition to having improved radar, the S-400 can reportedly fire several new and upgraded missiles with ranges up to 250 miles.
S-400 Triumf launch vehicle
China reportedly has 15 divisions of the S-400's predecessor, the S-300, stationed along the coast of Fujian, a province in the country's southeast overlooking northern Taiwan.
Depending on which missiles China's S-400s are equipped with, batteries in Fujian could reportedly cover all of Taiwan, while batteries placed in northern Shandong province could reach the Diaoyu/Senkaku Islands, over which Japan and China dispute control.
While its eventual armaments are not clear, the S-400 arrives in China at a time of increased tension in the region.
China has been more hostile toward Taiwan, which claims independence but China views as its territory, since Taiwan's 2016 election of President Tsai Ing-wen, who has said she wants peace but Beijing suspects wants formal independence.
China has stepped up its military exercises around Taiwan, including several in April 2018, which were followed by two US Air Force B-52H Stratofortress bombers patrolling through the area — reportedly flying within 155 miles of the southern Chinese coast.
This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.
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