title: North Korea says naval blockade would be 'act of war', vows action
text: SEOUL (Reuters) - North Korea on Thursday warned it would take  merciless self-defensive  measures should the United States enforce a naval blockade, which Pyongyang sees as  an act of war , the isolated nation s state media said. Citing a foreign ministry spokesman, the North s KCNA news agency said a naval blockade would be a  wanton violation  of the country s sovereignty and dignity. U.S. President Donald Trump was taking an  extremely dangerous and big step towards the nuclear war  by seeking such a blockade, it added. It was not immediately clear what U.S. proposal the agency was referring to.  Should the United States and its followers try to enforce the naval blockade against our country, we will see it as an act of war and respond with merciless self-defensive counter-measures as we have warned repeatedly,  the agency said. 