New administration is not expected to reverse Washington's trend in focusing more on Asia and on pulling its forces out of conflict zones

But Johnson faces uphill battle at home, where opposition parties and some of his own allies in the House of Commons warn they won't support it

Agreement still needs to be ratified by British lawmakers and the bloc; European Commission's Juncker says deal is 'fair and balanced'

EU chief says political solution is only way to end the Syrian conflict; NATO calls for Turkey to avoid actions that may further destabilize the region

British PM warns proposal is 'final' offer, but his complex new solution meets an initially cool response from Brussels

Following briefing with White House official, bloc's leaders call for US proposal to take into account 'agreed international parameters' for solving conflict

US president's Mideast peace adviser to meet EU’s Juncker amid widespread doubts, including within Trump administration, about proposal's feasibility