On Monday, the US Department of the Treasury said it would apply severe economic restrictions on a number of Russian firms that work closely with the Kremlin. One of the companies was identified as Digital Security, which Washington says has been helping Russian intelligence agencies develop their offensive cyber capabilities. Two of Digital Security’s subsidiaries, Embedi and ERPScan, were also placed on the US Treasury Department’s sanctions list. Monday’s statement by the Treasury Department named another Russian firm, the Kvant Scientific Research Institute, which it described as a front company operated by the Russian Federal Security Service (FSB).

But the Russian firm that features most prominently in Monday’s announcement is Divetechnoservices, an underwater equipment manufacturer. The US alleges that the FSB paid the company $15 million in 2011 to design equipment for use in tapping underwater communications cables. According to Washington, equipment designed by Divetechnoservices is today used by a fleet of Russian ships that sail on the world’s oceans searching for underwater communications cables to tap. One such ship, according to reports, is the Yantar (pictured), ostensibly an oceanic research vessel, which Washington says is used to detect and tap into underwater communications cables.

In addition to Divetechnoservices, the US Treasury has named three individuals who will face economic sanctions due to what Washington says is their personal involvement with the underwater hardware manufacturer. They are: Vladimir Yakovlevich Kaganskiy, the company’s owner and former director; Aleksandr Lvovich Tribun, who serves as Divetechnoservices’ general director; and Oleg Sergeyevich Chirikov, identified as the manager of Divetechnoservices’ underwater surveillance program. These men —all Russian citizens— will not be able to enter into business relationships with American companies or citizens. On Tuesday, Russia’s Ministry of Foreign Affairs dismissed the latest round of US sanctions as an act of desperation. The White House would fail in its effort to “force the Russian Federation to change its independent course of action in the international arena”, said the Russian Ministry of Foreign Affairs.