Trump’s election victory has sparked hope of a diplomatic resolution to the conflict, as the Republican—who is set to return to office on January 20—has long maintained that a peace settlement is the only way to end the fighting.

However, the prospect of a quick peace deal has raised concerns in Kyiv and among its European allies that it might come at a steep cost—one that may involve forcing Ukraine to cede large parts of its territory to Russia.

Trump has nominated Keith Kellogg, a former national security adviser and retired lieutenant general in the U.S. military, to act as his special envoy to Ukraine and Russia.

In a research paper published last April, Kellogg outlined plans for how the U.S. could end the war, suggesting that Washington could make further aid to Ukraine conditional on Kyiv agreeing to engage in peace talks with Russia while continuing to provide support if Moscow refused to participate.