Several senior administration officials, including President Donald Trump, have grown “frustrated” with Ukrainian officials’ critiques of their efforts to end the country’s war with Russia, a top administration official said.

The administration has begun a significant push to end the war over the last week. Several officials have traveled overseas to meet with Ukrainian and Russian leaders separately and NATO allies, while Trump spoke with Russian President Vladimir Putin and Ukrainian President Volodymyr Zelensky. In recent days, Trump officials and Zelensky have traded criticisms, creating massive controversy in Washington and across Europe.