Mr. Trump said any guarantees would involve U.S. "coordination."

Allied talk of sending European peacekeeping forces to protect Ukraine as part of a possible peace deal with Russia has sparked a backlash in Germany, a country still scarred by its militaristic Nazi...

But there remains real fear in Ukraine that they could be sold out as the White House seems loath to pressure Moscow with sanctions and military might, instead turning the screws diplomatically on Ky...