The U.S. sent powerful B-1B bombers from Guam for joint exercises with the South Korean Air Force over the Korean Peninsula late Tuesday as President Donald Trump gathered his top national security advisers to discuss "a range of options" for dealing with North Korea's nuclear ambitions.

The South Korean military said Wednesday that two of its F-15K fighter jets had linked up with the U.S. B-1Bs after they entered South Korean airspace off the east coast. The warplanes conducted an air-to-ground missile drill, flying across the peninsula to the waters between South Korea and China, where they conducted a similar firing exercise, the Yonhap news agency quoted the South's Joint Chiefs of Staff as saying.

The joint chiefs called the exercises routine and said they had "showed off the allies' resolve for strong retaliation against North Korea's nuclear and missile threats."