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The training mission, already under way, represents the deepest American involvement yet in the Syrian conflict, though the size and scope of the mission is not clear, nor is its host country. The offer of nonlethal assistance is expected to come from Secretary of State John Kerry at a meeting on Thursday in Rome with opposition leaders. Mr. Kerry is also expected to raise the prospect of direct financial aid, though officials cautioned that the White House still had to sign off on all the elements.

Before arriving in Rome on Wednesday, Mr. Kerry declared in Paris that the Syrian opposition needed additional assistance and indicated that the United States and its partners planned to provide some.

Under a broad definition of "nonlethal," assistance to the opposition could include items like vehicles, communications equipment and night vision gear. The Obama administration has said it will not — at least for now — provide arms to the opposition.

One major goal of the administration is to help the opposition build up its credibility within Syria by providing traditional government services to the civilian population. Since the conflict erupted two years ago, the United States has sent $365 million in humanitarian aid to Syrians. American officials have been increasingly worried that extremist members of the resistance against the government of President Bashar al-Assad, notably the Al Nusra Front, which the United States has asserted is affiliated with Al Qaeda, will take control of portions of Syria and cement its authority by providing public services, much as Hezbollah has done in Lebanon.

"Some folks on the ground that we don't support and whose interests do not align with ours are delivering some of that help," Mr. Kerry said.

To blunt the power of extremist groups, the United States wants to help the Syrian Opposition Council, the coalition of Syrian resistance leaders it backs and helped organize, deliver basic services in areas that have been wrested from the control of the Assad government.

Another major goal in providing assistance is to jump-start negotiations over a political transition by sending a message to Mr. Assad that the rebels would ultimately prevail on the ground.

"He needs to know that he can't shoot his way out of this," Mr. Kerry said of Mr. Assad.

The main significance of the policy shift, officials said, is not just the type of equipment that would be sent to the opposition, but who the recipients would be.

Until now, none of the aid the United States has supplied has been sent to the Free Syrian Army fighters, who are doing battle with Mr. Assad. Rather, the distribution of assistance has been limited to local councils and unarmed groups. But this would change if the administration expanded its assistance.

What remains off the table, at least as far as the White House is concerned, are weapons. President Obama last year rejected a proposal by the Central Intelligence Agency, the State Department and the Pentagon to arm a select cadre of rebels. American officials indicated Wednesday that the White House was still opposed to providing weapons.

Still, one official said that the financing the United States planned to send to the resistance might indirectly help the rebels arm themselves as it might free up other funds to purchase weapons.

The United States is not the only nation that is planning to take the step of sending nonlethal assistance to armed groups. Last week, the European Union agreed to a British proposal that nonlethal equipment could be sent. Britain and other members are currently discussing precisely what sort of equipment would be allowed under the terms of the European decision.

"In the face of such murder and threat of instability, our policy cannot stay static as the weeks go by," the British foreign secretary, William Hague, said after a meeting with Mr. Kerry in London on Monday. "We must significantly increase support for the Syrian opposition. We are preparing to do just that."

The French foreign minister, Laurent Fabius, also called for increased support to the opposition after a meeting with Mr. Kerry in Paris on Wednesday, although he did not specify what sort of aid France planned to provide.

"If we want to have a new regime, we have to encourage the opposition," Mr. Fabius said. "We have to help the situation to move."

The comments of the secretary of state and allied officials have generated considerable expectations for the Thursday meeting, which will be attended by Moaz al-Khatib, the leader of the Syrian opposition coalition, and other coalition members.

Earlier this week, Mr. Khatib had balked at attending the meeting, reflecting the deep disappointment in the Syrian opposition over what it feels is the failure of major powers to help in its effort to defeat Mr. Assad. But he relented after a phone call from Mr. Kerry, which was followed up by a call from Vice President Joseph R. Biden Jr.

Mr. Kerry's meeting with Mr. Khatib will be his first with the Syrian opposition leader. Mr. Kerry said the input from the opposition would enable the administration to assess what steps were needed.

Among the unanswered questions is how additional American aid would be channeled to the rebel groups. If it flows through the Supreme Military Council affiliated with the Syrian opposition coalition, some experts said, it may not reach the armed groups that are making the biggest gains against the Assad government.

"The problem is the Supreme Military Council does not have tentacles on the ground," said Andrew J. Tabler, a Syria expert and senior fellow at the Washington Institute for Near East Policy. "If you provide a bunch of bandages and body armor to them, it may not matter much."

Still, Mr. Tabler said the administration's decision to take this step was a welcome sign that its policy of steering clear of any military involvement in the conflict was no longer tenable.

"They're still reluctant, so they're moving incrementally," he said. "But the Obama administration has to look at one reality: what they have done isn't working."