The Biden administration is turning to an unlikely interlocutor as North Korean troops move into combat position to help Russia in its war in Ukraine.

       To convey threats to North Korea, U.S. officials are talking to China.

       And American officials say they hope the conversations further stoke any suspicions China might feel about the troop deployment.

       The U.S. government has assessed that China is uneasy about the rapidly strengthening security partnership between Russia and North Korea. China is North Korea’s longtime ally and its most powerful economic and military partner, but the Russia-North Korea collaboration means Beijing has to increasingly share influence over Pyongyang with Moscow.

       And North Korea’s intervention in Ukraine draws Europe deeper into East Asian security matters, which China does not want. On Thursday, North Korea launched an intercontinental ballistic missile, its first such test in almost a year, raising alarms among nations around the world.

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       The State Department has raised the issue of the troops directly with Chinese officials in recent days, a senior administration official told The New York Times. The latest conversation took place on Tuesday, when Kurt Campbell, the deputy secretary of state, Daniel J. Kritenbrink, the department’s top Asia official, and James O’Brien, the top Europe official, all met with Chinese diplomats for several hours at the home of Ambassador Xie Feng in Washington.

       And Secretary of State Antony J. Blinken spoke to Andriy Yermak, a top Ukrainian official, the same day about diplomatic efforts with China and other nations, the official said. Mr. Blinken said at a news conference on Thursday that he expected Russia to send the North Koreans into combat “in the coming days,” and that they would be legitimate military targets once they were in battle.

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