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.