WASHINGTON — The Trump Administration, warning that North Korea is “begging for war,” is pressing China and other members of the United Nations Security Council to cut off all oil and other fuels to the country.

The effort, which senior administration officials described as a last best chance to resolve the standoff with the North using sanctions rather than military means, came as South Korean officials said Monday that they had seen evidence that North Korea may be preparing another test, likely of an intercontinental ballistic missile.

That test, which would be the nation’s third in a month, could be timed to mark the anniversary of the founding of North Korea by Kim Il-sung, the grandfather of the current leader. It is unclear where the test might be aimed, but Pentagon officials said they were examining options in case it was meant to demonstrate that the North could put a missile, with accuracy, off the coast of Guam, an American territory.

The call for the fuel cutoff, which is expected to be part of a draft resolution that the United States is beginning to discuss privately with other members of the Security Council, came a day after North Korea’s most powerful nuclear test in the 11 years it has been detonating nuclear weapons.