A U.S.-led battalion of more than 1,100 soldiers will be deployed in Poland from the start of April, a U.S. commander said on Monday, as the alliance sets up a new force in response to Moscow’s 2014 annexation of Crimea. More than 900 U.S. soldiers, around 150 British personnel and some 120 Romanian troops will make up the battlegroup in northeastern Poland, one of four multinational formations across the Baltic region that Russia has condemned as an aggressive strategy on its frontiers. Britain, Canada and Germany are leading the other three battlegroups in Estonia, Latvia and Lithuania, which are due to be operational by June. They will have support from a series of NATO nations including France. In total, some 4,000 NATO troops – equipped with tanks, armored vehicles, air support and hi-tech mission information rooms – will monitor for and defend against any potential Russian incursions.