Trump wants to talk about reducing nuclear arsenals at the trilateral talks on Thursday and is also set to bring up his war in Iran – but he is not expected to discuss Russia's war in Ukraine, US officials said.

The three leaders will meet on the sidelines of the Asia-Pacific Economic Cooperation (APEC) summit in the southern Chinese city, White House spokeswoman Olivia Wales told reporters.

"The president has made it clear that, among other topics, he will discuss the reduction of nuclear weapons in the world. This proliferation, President Trump believes, is very dangerous," Wales said.

One of the major conflicts dominating Trump's second term as president will feature, but the other will not, the US officials said.

"I think the president does intend to talk about Iran in the trilateral meeting with Xi Jinping and Vladimir Putin," a senior US official, speaking on condition of anonymity, told reporters on a call.

Washington has a "whole other track" of negotiations with Kyiv and Moscow aimed at ending the war in Ukraine, the official added, referring to talks that US envoys have had in recent days with Putin and Ukrainian President Volodymyr Zelensky.

"China is not really a part of that track, so it doesn't seem appropriate to have the Ukraine discussion there," the official added.

Tesla and Space X boss Elon Musk will accompany Trump on his trip to China but won't be involved in the meeting with Xi and Putin, the officials said.

Trump will also hold a bilateral working lunch and meeting with the Chinese president on Thursday – their fourth meeting since the US president's return to power last year.

But Trump is not scheduled to have a separate one-on-one with Putin.

Among other topics, Nvidia chief executive Jensen Huang's resignation over an affair with an alleged Chinese spy is not expected to come up in Trump's meetings with Xi, the officials said.

"The situation with Nvidia should not really have any bearing on the trip," a second US senior official said.

The United States also did not plan to discuss export controls on sensitive chip technology, which were at the heart of the Nvidia scandal.

"We do not negotiate American export controls. These are national security matters that we develop in the administration [...] and we don't expect it to figure at all in any of our conversations with the Chinese while we're there," the second official said.

Trump will leave Washington on Monday and arrive in the Philippines on Tuesday for the ASEAN summit before heading to Shenzhen.

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