UNITED NATIONS — The United Nations Security Council on Monday ratcheted up sanctions yet again against North Korea, but they fell significantly short of the far-reaching penalties that the Trump administration had demanded just days ago.

While the sanctions were described in Washington and other capitals as the most extensive yet, in the end they amounted to another incremental increase of pressure on the country, even after it detonated its sixth and most powerful nuclear device.

It was far from clear that the additional penalties would accomplish what the Trump administration said was its goal: To force North Korea to halt its nuclear and ballistic missile tests and reopen some kind of negotiation toward eventual nuclear disarmament.

The North has claimed that last week’s detonation, in an underground site, had proven it could build a hydrogen bomb, far more powerful than ordinary atomic weapons. It is still unclear how far along the road to a hydrogen bomb the country has gone.