US President Donald Trump on Wednesday was reportedly "frustrated" with Ukrainian President Volodymyr Zelensky, accusing him of "moving in the wrong direction" and threatening to abandon talks on a Russia-Ukraine ceasefire. US Vice President JD Vance said earlier that a "land swap" would be necessary to reach a deal, but Zelensky said Ukraine would not hand over Crimea, which Russia illegally annexed over a decade ago, to Putin in any agreement.