UK Prime Minister Keir Starmer jets off to Washington this week for his first steps on the world stage, just days after taking office following a landslide election victory. Starmer, 61, will attend NATO’s 75th anniversary summit in the US capital on his debut foreign trip since becoming British leader last Friday. He will reaffirm Britain’s enduring support for the Western military alliance and Ukraine’s fight against Russian aggression. The visit kicks off a whirlwind of international diplomacy in Starmer’s first two weeks in power, with the UK also hosting a European leaders’ conference nex…