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“This summit sounds like a program review: All we are getting are briefings by bureaucrats on what they have been doing,” said Ken Luongo, president of the Partnership for Global Security. “Technical details at a political summit have their place, but it’s insufficient. Where’s the vision?”

Miles Pomper, a senior research associate at the Monterey Institute of International Studies, said that other countries “are not getting a lot out of the Russians about what their commitments are at this summit.”

Mr. Pomper said he would have liked the Russians to announce they were converting two of their reactors from highly enriched uranium to low-enriched uranium.

More than 50 world leaders, including resident Obama, Russian President Dmitry Medvedev and Chinese President Hu Jintao, attended the summit.