The United States will officially open a new air defence base in northern Poland on Wednesday, as Warsaw seeks to reassure citizens that NATO guarantees their security amid jitters after Donald Trump's presidential election victory.

"The Polish-American alliance is strong, regardless of who governs in Warsaw and Washington," Polish Foreign Minister Radoslaw Sikorski said.

The Kremlin has hit out at the U.S. after it opened a new missile base in NATO Nation Poland. Kremlin spokesperson said that the U.S. was moving it military close to Russian borders. He cited Vladimir Putin to claim that the U.