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U.S. President Donald Trump and Russian President Vladimir Putin shook hands during a photo op at the Asia-Pacific Economic Cooperation (APEC) summit in Danang, Vietnam.

Trump and Putin will not have a formal sit-down during the summit, but White House press secretary Sarah Sanders said it was “possible” and “likely” that they could have a less formal encounter in either Danang or in the Philippines.

"There was never a meeting confirmed, and there will not be one that takes place due to scheduling conflicts on both sides," Sanders said. "There's no formal meeting or anything scheduled for them. Now, they're going to be in the same place. Are they going to bump into each other and say hello? Certainly possible and likely. But in terms of a scheduled, formal meeting, there's not one on the calendar."

Secretary of State Rex Tillerson had told reporters on Thursday that there was no reason to schedule a meeting if the U.S. and Russia are unable to make significant progress on issues like Syria, Ukraine and North Korea.

"The view has been if the two leaders are going to meet, is there something sufficiently substantive to talk about that would warrant a formal meeting?" he said.

Trump and Putin had their first face-to-face meeting at a G20 summit in July to discuss allegations of Russian meddling in the 2016 election.

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