SEOUL, South Korea — North Korea said Saturday that it had told the United States that it would impose a temporary moratorium on nuclear tests if Washington canceled its joint annual military exercises with South Korea to help promote dialogue on the divided Korean Peninsula.

The North proposed its “crucial step” in a message it delivered to the United States on Friday through an unspecified channel, the North’s official Korean Central News Agency said. In the past, North Korea has relayed messages to Washington through its United Nations mission in New York.

Until now, the United States has dismissed North Korea’s routine demand for an end to its joint military exercises with South Korea. The North has called them a rehearsal for an invasion while the United States and South Korea have insisted that their annual war games are defensive in nature.

But the North’s latest proposal included a new incentive for Washington, offering to temporarily suspend nuclear tests in return for a suspension of the joint military exercises this year.