During the Cold War, the Soviets will use their submarines to sink this ship carrying Bradley’s. But the Russian navy isn’t the Soviet navy so they may not have the capability to do that.
During the Cold War the Soviets never did such a thing.
The US and Soviet war plans included a submarine campaign to block transatlantic traffic - a replay of the WWII “Battle of the Atlantic” against the U-Boats. But it never came to that.