Elements of the proposed policy, which officials cautioned have not yet been finalized, are being discussed by Secretary of State John F. Kerry in meetings this week and next with allies in Europe and the Middle East as part of a coordinated effort to end the bloody stalemate, which has claimed about 70,000 lives.
Those talks — along with a nearly two-hour meeting in Berlin on Tuesday with Russian Foreign Minister Sergei Lavrov and a Thursday conference with allies and leaders of the Syrian Opposition Coalition in Rome — are expected to weigh heavily on administration deliberations.
Kerry has repeatedly made indirect references to a policy shift during his travels. He told a group of German students Tuesday that the United States wants a “peaceful resolution” in Syria, but if its leaders refuse to negotiate and continue to kill citizens, “then you need to at least provide some kind of support” for those fighting for their rights.
On Monday in London, he said: “We are not coming to Rome simply to talk. We’re coming . . . to make decisions about next steps.”
Opposition political leaders had threatened to boycott the Rome meeting, but they were persuaded to attend after telephone calls in which Kerry and Vice President Biden said substantive proposals would be on the table.
The pending shift to a more active role comes as the administration and its partners backing the opposition, including Britain, France and countries in Syria’s region, have concluded that there is little immediate chance for a negotiated political settlement with Syrian President Bashar al-Assad.
Western officials have also acknowledged that the opposition coalition is unlikely to quickly develop a governing infrastructure or attract significant support from fence-sitting Syrian minorities and Assad supporters.
The opposition, meanwhile, has been strident in its criticism of the United States and others for refusing to provide it with the resources to organize a quasi-government and broaden its support inside Syria.
The Obama administration, citing legal restrictions on direct funding of the opposition, has funneled $385 million in humanitarian aid through international institutions and nongovernmental organizations, most of which operate under Syrian government supervision.
On the military side, the administration has established direct contact with rebel leaders but has limited aid to communications equipment delivered indirectly. A push last summer to arm the rebels, backed by then-Secretary of State Hillary Rodham Clinton, then-CIA Director David H. Petraeus and Defense Secretary Leon E. Panetta, was rejected by the White House in favor of continued efforts to build the political opposition.