By Phil Stewart and Dmitry Antonov WASHINGTON/MOSCOW (Reuters) -The United States will send nearly 3,000 extra troops to Poland and Romania to reinforce Eastern European NATO allies in the face of what Washington describes as a Russian threat to invade Ukraine, U.S. officials said on Wednesday. Russia, for its part, signalled it was in no mood for compromise by mocking Britain, calling Prime Minister Boris Johnson “utterly confused” and ridiculing what it said was the “stupidity and ignorance” of British politicians. Moscow has massed more than 100,000 troops https://graphics.reuters.com/RUSSI…