The US administration believes the tripartite format for talks on resolving the conflict in Ukraine may eventually expand to include Washington's European allies, Donald Trump's son-in-law Jared Kushner said. "All parties remain intensively involved in preparations for substantive and productive negotiations," he wrote in X, referring to the upcoming tripartite talks in Abu Dhabi, involving representatives of Russia, the US and Ukraine. "We will consult closely with our European partners on the sidelines, and if progress is made, we will aim to move toward a broader multilateral format with their direct participation," Kushner added.