SOFIA (Reuters) – More than 150 British troops will join a new NATO combat unit group in Bulgaria and talks are underway with Italy, Bulgarian Prime Minister Kiril Petkov said on Thursday, as NATO bolsters its eastern flank after Russia’s invasion of Ukraine. The United States has already agreed to provide a Stryker mechanized infantry company for Bulgaria’s unit that will have up to 1,000 troops. “Together, we are showing coordination and strength,” Petkov told reporters in Brussels. NATO has increased its presence on its eastern borders, with some 40,000 troops spread from the Baltic to the …