China said on Thursday it would not join nuclear talks "at this stage" after the expiry of the U.S.-Russian START treaty triggered fears of a global arms race.

"China's nuclear capabilities are of a totally different scale as those of the United States and Russia (and) will not participate in nuclear disarmament negotiations at this stage," Beijing's foreign ministry spokesman Lin Jian told a news conference.

Russia said Thursday there had been "progress" in talks with Ukraine in Abu Dhabi on finding an end to the four-year-war sparked by Moscow's full-scale invasion of its pro-Western neighbor.

"There is definitely progress, things are moving forward in a good, positive direction," Russian negotiator Kirill Dmitriev told state media.

Nuclear talks between Iran and the United States will take place Friday in Oman, the Iranian foreign minister said, as tensions between the countries remain high following Tehran's bloody crackdown on nationwide protests last month.

The announcement Wednesday by Iranian Foreign Minister Abbas Araghchi came after hours of indications that the anticipated talks were faltering over changes in the format and content of the talks. U.S. President Donald Trump, meanwhile, sent a blunt warning to Iran's Supreme Leader Ayatollah Ali Khamenei ahead of the talks.

Russian leader Vladimir Putin hailed Moscow's economic, political and security ties with Beijing as a "stabilizing" factor in turbulent times globally, in a video call with China's Xi Jinping on Wednesday.

Moscow and Beijing have sought to present a united front against the West, with ties deepening since Russia's 2022 Ukraine offensive.

U.S. President Donald Trump on Tuesday called for Americans to move on from the Jeffrey Epstein scandal and again said he had been cleared by the latest release of millions of documents.

"Nothing came out about me other than it was a conspiracy against me, literally, by Epstein and other people. But I think it's time now for the country to maybe get on to something else like health care or something that people care about," he told reporters at the White House.

A second round of peace negotiations between Russia and Ukraine mediated by the United States has begun in the United Arab Emirates, Ukraine's lead negotiator announced Wednesday.

"Another round of negotiations has begun in Abu Dhabi," the head of the Ukrainian delegation, Rustem Umerov, wrote on social media, adding Kyiv's team was seeking "to achieve a just and lasting peace."

The last remaining nuclear arms pact between Russia and the United States is set to expire Thursday, removing any caps on the two largest atomic arsenals for the first time in more than a half-century.

The termination of the New START Treaty would set the stage for what many fear could be an unconstrained nuclear arms race.

President Donald Trump held a nearly two-hour meeting on Tuesday with his Colombian counterpart, Gustavo Petro, that both called friendly — a dramatic about-face from weeks earlier, when Trump accused Petro of pumping cocaine into the U.S. and threatened his country with military action.

Afterward, Trump tried to downplay his past criticisms, saying, "He and I weren't exactly the best of friends, but I wasn't insulted because I never met him. I didn't know him at all."

A U.S. Navy fighter jet shot down an Iranian drone that was approaching the aircraft carrier USS Abraham Lincoln in the Arabian Sea, U.S. Central Command said Tuesday, threatening to ramp up tensions as the Trump administration warns of possible military action to get Iran to the negotiating table.

The drone "aggressively approached" the aircraft carrier with "unclear intent" and kept flying toward it "despite de-escalatory measures taken by U.S. forces operating in international waters," Central Command spokesman Capt. Tim Hawkins said in a statement.

The Kremlin warned on Tuesday that the world was heading into a "dangerous" moment as the last U.S.-Russia nuclear treaty is set to expire this week.

New START, the last nuclear treaty between Washington and Moscow after decades of agreements dating to the Cold War, is set to expire on Thursday, and with it restrictions on the two top nuclear powers.