10. Biden will leave the White House on Jan. 20, 2025, when U.S. President-elect Donald Trump officially takes office. Trump's presidency may radically alter Washington's policy toward Ukraine and Russia. "President Biden will have the opportunity over the next 70 days to make the case to the Congress and to the incoming administration that the United States should not walk away from Ukraine, that walking away from Ukraine means more instability in Europe," Sullivan said. Sullivan said Biden would urge lawmakers to provide "ongoing resources" to Ukraine but declined to give details about what those resources would include. The Biden administration has already committed to sending Kyiv the remaining $6 billion in allocated military aid before Trump's second term begins. Sullivan said those funds would be  sent "on time and in full" before Jan.