(Reuters) - United Nations Secretary-General Antonio Guterres condemned North Korea s nuclear test on Sunday as  profoundly destabilizing for regional security  and called on the country s leadership to cease such acts, his spokesman said in a statement.  This act is yet another serious breach of the DPRK s international obligations and undermines international non-proliferation and disarmament efforts. This act is also profoundly destabilizing for regional security,  U.N. spokesman Stephane Dujarric said.  North Korea is also known as the DPRK. 