WASHINGTON — Hillary Clinton on Thursday delivered her most robust attack yet on her likely Republican opponent, Donald J. Trump, declaring him temperamentally unfit to be commander in chief. But although her campaign had described the speech as a major foreign policy address, Mrs. Clinton spent more time ridiculing and dismantling Mr. Trump’s statements than she did elucidating her positions. Here are a few key issues she did not discuss.

No-fly zone in Syria

In October 2015, Mrs. Clinton told a Boston television station, “I personally would be advocating now for a no-fly zone and humanitarian corridors to try to stop the carnage on the ground and from the air.” She repeated that call during a Democratic debate two months later. But President Obama has resisted such a move. The Pentagon is also leery: Military commanders warn that it would require substantial numbers of American ground forces and invite a deadly confrontation with the Syrians and the Russians. She has not fleshed out the proposal since then.

How to handle Vladimir V. Putin

Last fall, Mrs. Clinton said, “I am in the category of people who wanted to do more in response to the annexation of Crimea and the continuing destabilizing of Ukraine.” Her aides said she supported a proposal to funnel defensive weapons, like Javelin antitank missiles, to Ukrainian troops. Mr. Obama argued that this would escalate a showdown with Russia — one that Mr. Putin would inevitably win, given Ukraine’s proximity, and its greater strategic value, to Russia. On Thursday, Mrs. Clinton made no mention of steps she would take to counter Mr. Putin’s aggression, saying only that she had gone “toe to toe” with Moscow as secretary of state.

What to do about Libya

Mrs. Clinton played a pivotal role in persuading Mr. Obama to take part in the 2011 NATO air campaign that toppled Col. Muammar el-Qaddafi. She has expressed no regrets about the intervention, even after Libya fell into chaos and four Americans were killed in the attack on a diplomatic outpost in Benghazi. Her aides attribute the country’s woes to the unwillingness of its new leaders to accept a peacekeeping force. But Mrs. Clinton has said little about how the United States can help put Libya back together, other than calling for patient engagement. On Thursday, she left Libya off the list of knotty issues she and Mr. Obama had confronted.