North Korean leader Kim Jong-Un has ordered further nuclear tests, state media said today, as military tensions surge on the Korean peninsula with South Korean and US forces engaged in large-scale joint exercises condemned by Pyongyang.

Since the joint drills began Monday, the North has issued daily warnings and statements, talking up its nuclear strike capabilities and threatening to turn Seoul and Washington into “flames and ashes.” Military tensions on the divided Korean peninsula have been on the rise since the North carried out its fourth nuclear test in January, followed by a long-range rocket launch last month.

South Korea and the United States responded by scaling up their annual joint drills, which Pyongyang has always condemned as provocative rehearsals for invasion. The UN Security Council responded to the North’s latest nuclear test and rocket launch by adopting tough, new sanctions, which Pyongyang condemned as a “gangster-like” provocation orchestrated by the United States. Reacting to Kim’s call for more nuclear tests, South Korea today said the North Korean leader was being “rash” and displaying his ignorance of international opinion.