The United States of America may withdraw from the negotiation process to resolve the full-scale war in Ukraine if White House leader Donald Trump believes he is being "used," warns White House Special Envoy for Ukraine Keith Kellogg on ABC News. "I think when you talk about walking away if he believes he's being used and that there is no hope in progress going forward, he goes: 'We’re done with this. Europe, we leave it over to you'," Kellogg stated, commenting on Trump’s threats to exit the negotiation process. Negotiations on resolving war in Ukraine Over the past few months,...