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Ellen Tauscher, undersecretary of state for arms control and international security, said last week that the outstanding issues in the START negotiations included sharing of telemetry data — electronic signals sent from missile flight tests — as well as Russian demands that missile defenses be included in the new treaty.

Mr. Jones and Adm. Mullen are visiting Moscow a week after a trip by another senior U.S. official, William J. Burns, undersecretary of state for political affairs. Mr. Burns represents the United States in international negotiations on Iran’s nuclear program, which also was discussed in his meetings and is expected to be part of the talks this week.

Washington and its Western allies want new sanctions on Iran for rejecting a proposal that would lift suspicion that it is developing a nuclear weapon under the cover of a civilian program. Russia has not been as opposed to sanctions as it has in the past, but China is resisting them, so U.S. officials hope Moscow could influence its friends in Beijing.