Officials at U.S.-mediated talks between Russia and Ukraine said Wednesday that the sides have agreed a large exchange of prisoners of war.

"One of the positives is we agreed that we're going to have the biggest humanitarian release of prisoners, which we're going to finalize the numbers tomorrow," Jared Kushner, U.S. President Donald Trump's son-in-law, said after the two days of talks in Abu Dhabi ended.

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