White House Press Secretary Karoline Leavitt said President Donald Trump is “frustrated” with Ukraine President Volodymyr Zelensky as peace negotiations continue with Russia.

Leavitt spoke to the press on Wednesday following the president taking to social media and accusing Zelensky of stalling negotiations with his “inflammatory” comments. Trump was responding to Zelensky declaring Ukraine will not formally cede Crimea to Russia as part of the negotiations to end Russia’s invasion.

Trump blasted Zelensky and former President Barack Obama — who was president when Crimea was invaded in 2014 — in his message.

“This statement is very harmful to the Peace Negotiations with Russia in that Crimea was lost years ago under the auspices of President Barack Hussein Obama, and is not even a point of discussion. Nobody is asking Zelenskyy to recognize Crimea as Russian Territory but, if he wants Crimea, why didn’t they fight for it eleven years ago when it was handed over to Russia without a shot being fired?” he wrote.

The president said they are “close” to a deal but Zelensky is making things more difficult.

He wrote:

It’s inflammatory statements like Zelenskyy’s that makes it so difficult to settle this War. He has nothing to boast about! The situation for Ukraine is dire — He can have Peace or, he can fight for another three years before losing the whole Country. I have nothing to do with Russia, but have much to do with wanting to save, on average, five thousand Russian and Ukrainian soldiers a week, who are dying for no reason whatsoever. The statement made by Zelenskyy today will do nothing but prolong the “killing field,” and nobody wants that!

Leavitt continued the president’s attacks outside the White House on Wednesday, accusing Zelensky of trying to “litigate” the war in the press. She also made clear Ukraine is not being asked to formally cede Crimea.

“President Zelensky has been trying to litigate this peace negotiation in the press. And that’s unacceptable to the president. These should be closed-door negotiations. The president’s national security team, his advisers, has exuded significant time, energy and effort to try to bring this war to an end. The American taxpayer has funded billions of dollars in this effort. And enough is enough. The president’s frustrated. His patience is running very thin.”