美国对乌克兰局势表示“极大的担忧”

TheUShasvoiced"greatconcern"aboutheightenedtensionineasternUkraineafterpro-Russiademonstratorsseizedgovernmentbuildingsinthreecities.乌克兰国内亲俄派示威者占领了东部三座城市的政府建筑，美国对此紧张的局势表示“极大的担忧”。USSecretaryofStateJohnKerrytoldRussiancounterpartSergeiLavrovinaphonecallthatanyRussianeffortsatdestabilisation"wouldincur