US President Donald Trump and Japanese Prime Minister Shinzo Abe today condemned North Korea for its "provocative and destabilising" behaviour, after the reclusive nation carried out its biggest nuclear test. North Korea claimed yesterday it had successfully tested a hydrogen bomb meant to be loaded onto an intercontinental ballistic missile. It was Pyongyang's sixth, and the most powerful nuclear test, which was set to raise tension in the region. <br/><br/>The White House said that the two leaders spoke over phone to discuss the North Korean actions as they pledged to continue close cooperation. During the call, Trump reaffirmed the commitment of the United States to defending its homeland, territories, and allies using the full range of diplomatic, conventional, and nuclear capabilities at its disposal.<br/><br/>Earlier in the day, US Defence Secretary James Mattis warned North Korea of massive military response to any threats from North Korea. He made a brief statement outside the West Wing of the White House after Trump held a meeting with a small group of his national security team. Senator Marco Rubio said North Korea's threatening actions today are a sober reminder that all nations, including China, must do everything in their power to stop and reverse Pyongyang's growing nuclear and missile programs.