A veteran Russian diplomat to the U.N. Office at Geneva says he handed in his resignation before sending out a scathing letter to foreign colleagues inveighing against the “aggressive war unleashed” by President Vladimir Putin in Ukraine. Boris Bondarev, 41, confirmed his resignation in a letter delivered Monday morning at the Russian diplomatic mission after a diplomatic official passed on his English-language statement to The Associated Press. “For twenty years of my diplomatic career I have seen different turns of our foreign policy, but never have I been so ashamed of my country as on Feb. 24 of this year,”...