WASHINGTON — Delegations from the U.S. and Russia are expected to meet this week to discuss arms control and the possibility of coaxing China into negotiating a new, three-way nuclear weapons pact, two senior administration officials said Monday.

PYONGYANG, North Korea — North Korea on Tuesday suggested it might call off its 20-month suspension of nuclear and missile tests because of summertime U.S.-South Korean military drills that the North calls preparation for an eventual invasion.

WASHINGTON — To counter Iran’s growing influence in the Middle East, the U.S. must maintain a strong diplomatic and military presence in neighboring Iraq, experts from the State Department and the Pentagon said at the Near East and Counterterrorism subcommittee hearing Tuesday.