While there is currently no special envoy for the war in Ukraine, Trump had privately expressed interest in creating the position.

Quickly winding down the Ukraine war was one of Trump’s central campaign promises, though he has avoided discussing how he would do so.

Kellogg, who was the chief of staff for the White House National Security Council during Trump’s 2017-2021 term and national security adviser to then-Vice President Mike Pence, will likely play a central role in attempting to resolve the conflict in his new position.

“Keith has led a distinguished Military and Business career, including serving in highly sensitive National Security roles in my first Administration,” Trump said on social media.

Kellogg’s plan for ending the war, which began when Russia invaded Ukrainian sovereign territory, involves freezing the battle lines at their prevailing locations and forcing both Kyiv and Moscow to the negotiating table, Reuters reported in June.

Kellogg drafted his plan for Ukraine alongside Fred Fleitz, who also served as chief of staff to the National Security Council under Trump.

Under their proposed strategy, the U.S. would tell Ukraine that it would only get more American weapons if it enters peace talks.

The U.S. would at the same time warn Moscow that any refusal to negotiate would result in increased U.S. support for Ukraine. NATO membership for Ukraine would be taken off the table for the immediate future.

That plan would be unlikely to please Kyiv, given that it would in practice give Russia uncontested control of parts of eastern Ukraine, at least for a significant period of time.