Companies building a multi-billion dollar bridge to link the Russian mainland with annexed Crimea, a project close to the heart President Vladimir Putin, were targeted by the United States in an updated sanctions blacklist on Thursday.
The U.S. Department of the Treasury added dozens of people and companies to the list, first introduced after Russia annexed the Crimean peninsula from Ukraine in 2014 and expanded over its support for separatist rebels in the east of the country.
As well as multiple subsidiaries of Russian gas giant Gazprom and 11 Crimean officials, the Treasury named seven companies directly involved in the construction of the 19 km (11.8 miles) road-and-rail connection across the Kerch Strait, dubbed "Putin's bridge" by some Russians.
Chief among those were SGM-Most, a subsidiary of lead contractor Stroygazmontazh which is already under U.S. sanctions, and sub-contractor Mostotrest, one of Russia's biggest bridge builders.
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"Treasury stands with our partners in condemning Russia's violation of international law, and we will continue to sanction those who threaten Ukraine's peace, security and sovereignty," said John Smith, acting director of the Treasury's Office of Foreign Assets Control, which levies sanctions.
Set to be the longest dual-purpose span in Europe when completed, the Kremlin sees its 212-billion rouble ($3.2 billion) bridge as vital to integrating Crimea into Russia, both symbolically and as an economic lifeline for the region. Putin has called the undertaking an historic mission.