The US on Tuesday flew two nuclear-capable long-range bombers over South Korea in a show of military strength in response to North Korea's most recent nuclear test, United States Forces Korea (USFK) said.
The supersonic B-1 bombers, which were deployed from the US Andersen Air Base on the Pacific island of Guam, made a low level flight through South Korean airspace and were accompanied by US and South Korean fighter jets, a USFK spokesman said.
"Today’s demonstration provides just one example of the full range of military capabilities in the deep resources of this strong alliance to provide and strengthen extended deterrence," USFK commander General Vincent Brooks said.
"The Alliance military forces remain ready to meet mutual defence obligations against threats to the security of the Korean Peninsula and the region," Brooks added.
After North Korea's fourth nuclear test in January, a US B52 bomber made a similar flight over South Korea.
The US Special Representative for North Korea, Sung Kim, said that Washington was working with other countries to push for further sanctions against Pyongyang, and that there would be "serious" consequences for further provocations, South Korean news agency Yonhap reported.
"I think it's clear that the latest nuclear test has strengthened, bolstered international resolve to hold the DPRK accountable," Kim said during a visit to Seoul.
South Korean intelligence officials reportedly said Monday North Korea was ready to conduct another nuclear test, days after Pyongyang carried out its fifth and possibly most powerful test to date.
"North Korea’s nuclear test is a dangerous escalation and poses an unacceptable threat," Brooks said.
The UN Security Council has condemned North Korea's latest nuclear test, which was carried out in defiance of UN resolutions, and vowed to take "further significant measures."