U.S. military forces are “fully prepared” to cross into Ukraine at a moment’s notice to fight a war against Russia.

The Army’s 101st Airborne Division, which boasts the “Screaming Eagles” moniker, has been deployed to Europe for the first time since World War II, practicing with live tank and artillery rounds not far from the Black Sea, across which Russia has taken territory from Ukraine, including Crimea, at a forward operating site on NATO’s eastern flank, according to CBS News.