The US is moving two nuclear submarines to strategic positions, in an apparent Cold War-era threat that followed former Russian president Dmitry Medvedev's response to his "dead economy" jibe.

Lockheed-built Trident II missiles are designed to provide nuclear deterrence support for the Navy’s Ohio -class and U.K.’s Vanguard -class submarines.

Lockheed Martin (NYSE: LMT) has received an $88 million contract modification from the U.S. Navy to provide Trident II D5 missile field processing and deployed system support.

As of Tuesday night, after Mr. Trump had changed his mind, that shipment, consisting of 30 Patriot missiles and other munitions, was in Poland, waiting to cross the border, officials said.