Russia on Friday accused the United States of brazenly threatening it after a senior U.S. general said Washington had drawn up a plan in case it needed to destroy air defenses in Russia's Kaliningrad exclave in Europe.

U.S. General Jeffrey Harrigian said on Tuesday that "If we have to go in there to take down, for instance, the Kaliningrad IADS (Integrated Air Defense System), let there be no doubt we have a plan to go after that," the Breaking Defense magazine reported.

Kaliningrad is a Russian region that lies on the Baltic Sea between EU members Lithuania and Poland. Moscow captured the region from Germany towards the end of World War Two.