WASHINGTON — The Obama administration, hoping that the conflict in Syria has reached a turning point, is considering deeper intervention to help push President Bashar al-Assad from power, according to government officials involved in the discussions.

While no decisions have been made, the administration is considering several alternatives, including directly providing arms to some opposition fighters.

The most urgent decision, likely to come next week, is whether NATO should deploy surface-to-air missiles in Turkey, ostensibly to protect that country from Syrian missiles that could carry chemical weapons. The State Department spokeswoman, Victoria Nuland, said Wednesday that the Patriot missile system would not be “for use beyond the Turkish border.”

But some strategists and administration officials believe that Syrian Air Force pilots might fear how else the missile batteries could be used. If so, they could be intimidated from bombing the northern Syrian border towns where the rebels control considerable territory. A NATO survey team is in Turkey, examining possible sites for the batteries.