The threats, pressure and ultimatums have come and gone, but Russian President Vladimir Putin has maintained Moscow’s uncompromising demands in Ukraine, raising fears he could use a planned summit with U.

"Though that may not be enough to compel Putin to seek peace, it does suggest that the walls are closing in on him."

President Donald Trump’s deadline for Russia to end its war in Ukraine or suffer severe economic punishment expires Friday, but it’s unclear how he plans to proceed amid new efforts toward a summit with Vladimir Putin and delicate trade negotiations with China.