washington u.s. ambassador moscow john tefft express strong disappointment protest russia decision cut u.s. diplomatic staff moscow seize dacha compound warehouse use american diplomats state department official say friday russia move come day u.s. senate vote slap new sanction russia put president donald trump tough position force take hard line moscow veto legislation anger republican party receive russian government notification state department official say condition anonymity ambassador tefft express strong disappointment protest u.s. express 'strong disappointment protest russia retaliation