The US has said it will use its “considerable military forces” on North Korea “if we must”, following Tuesday’s long-range missile test, the BBC reports.
US ambassador Nikki Haley said a new resolution would also be tabled against Pyongyang at the United Nations.
She described the test as a sharp military escalation and also threatened to use trade restrictions.
Hours after she spoke, the US and South Korea fired more missiles into the Sea of Japan as part of military drills.
But Pyongyang said it would not negotiate unless the US ended its “hostile policy” against North Korea. China and Russia also opposed the use of military force.
Tuesday’s missile launch, the latest in a series of tests, was in defiance of a ban by the UN Security Council.