A senior administration official who briefed reporters said the three leaders will discuss reducing nuclear stockpiles. It will be the first time the leaders of the countries with the world's largest nuclear weapons stockpiles meet to discuss nonproliferation issues.

"This is hopefully the beginning of a conversation that can be productive going forward," the official said, cautioning that the U.S. does not expect any reduction agreement to emerge from the talks.

The Iran war will also be part of the discussions, but Ukraine is not on the agenda, according to the official.

The meeting comes as the three nuclear-armed powers face heightened global tensions. The exclusion of Ukraine from the agenda is notable given Russia's ongoing war there, which has strained U.S.-Russia relations and raised concerns about nuclear risks.

The talks represent a rare trilateral engagement on nuclear issues among the three countries, which together possess the vast majority of the world's nuclear weapons. Any dialogue on reducing stockpiles could have significant implications for global security and arms control efforts.

However, the official's caution that no agreement is expected suggests the meeting is intended as an opening conversation rather than a negotiating session. The inclusion of the Iran war on the agenda reflects the broader regional security concerns facing the leaders.

The White House confirmation follows reports that the three leaders would meet. Further details about the location and format of the meeting were not immediately available.