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U.S. President Joe Biden and China's Xi Jinping will hold their fifth call as leaders on Thursday, as concerns rise over a possible visit to Chinese-claimed Taiwan by U.S. House Speaker Nancy Pelosi.

White House officials have said the long-planned call, scheduled for 8:30 a.m. (1230 GMT), will have a broad agenda, including discussion of Russia's invasion of Ukraine, which China has yet to condemn.

At its core, U.S. officials see the exchange as another chance to manage competition between the world's two largest economies, whose ties are increasingly clouded by tensions over democratically governed Taiwan, which Xi has vowed to reunite with the mainland, by force if necessary.

Beijing has issued escalating warnings about repercussions should Pelosi visit Taiwan, a move that would be a dramatic, though not unprecedented, show of U.S. support for the island, which says it is facing increasing Chinese military and economic threats.

Washington does not have official relations with Taiwan and follows a "one-China" policy that recognizes Beijing, not Taipei, diplomatically. But it is obliged by U.S. law to provide the island with the means to defend itself, and pressure has been mounting in Congress for more explicit support.

"This is about keeping the lines of communication open with the president of China, one of the most consequential bilateral relationships that we have, not just in that region, but around the world, because it touches so much," White House national security spokesman John Kirby told reporters on Wednesday.

One person briefed on planning for the call said the Biden administration thinks leader-to-leader engagement is the best way to lower tensions over Taiwan.

Xi has an interest in avoiding a tense confrontation with the United States as he seeks an unprecedented third term in office at a congress of China's ruling Communist Party, which is expected in October or November, some analysts believe.

Biden also wants to discuss climate and economic competition issues, the person briefed said, as well as the idea of placing a price cap on Russian oil to punish Moscow for its war in Ukraine, an issue Treasury Secretary Janet Yellen raised with Chinese counterparts earlier in July. 

The Biden administration has been debating whether to lift some tariffs on Chinese goods as a way to ease soaring inflation, but U.S. officials have said a decision was not expected ahead of the call.

When Biden last spoke to Xi in March, he warned of "consequences" if Beijing gave material support for Russia's war, and the U.S. government believes that that red line has not been crossed in the months since.

A spokesman for China's foreign ministry declined to confirm that the call would take place or share details when asked about it during a regular briefing in Beijing on Thursday.

"The Chinese and U.S. heads of state maintain communication using various means," Chinese foreign ministry spokesman Zhao Lijian said.

"China will announce information about this in a timely manner," he said.

TOXIC TIES

The White House has reiterated that its "one-China" policy has not changed despite speculation over a possible trip by Pelosi, which the speaker has yet to confirm.

The last time a speaker of the U.S. House of Representatives visited Taiwan was in 1997, and as a co-equal branch of government, the U.S. executive has little control over congressional travel.

China has grown more powerful militarily and economically since, and some analysts worry such a visit at a time of fraught ties, could spur a crisis across the 100-mile (160-km) wide Taiwan Strait waterway separating China and Taiwan.

"The relationship is in such a toxic state. Mutual distrust is really at an all-time high. I think people don't realize how dangerous this particular moment is," said Bonnie Glaser, a China expert at the German Marshall Fund of the United States.

She said Biden and Xi needed to focus their call on de-escalation, including possible mechanisms to reduce the risk of mishaps.

Kirby said the administration has been in touch with Pelosi's office to make sure she has "all the context" she needs to make decisions about her travel.

China has given few clues to specific responses it might take if Pelosi, a long time critic of China, particularly on human rights issues, does go to Taiwan.

Martin Chorzempa, a senior research fellow at the Peterson Institute for International Economics, said playing up the Taiwan issue could serve Xi as a domestic distraction from China's slowing economy, but "any reaction strong enough to trigger U.S. sanctions would create massive damage to China and the world economy." (Reuters)