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.

For President Vladimir V. Putin of Russia, it is an opportunity not just to end the Ukraine war on his terms but to split apart the Western security alliance.

President Donald Trump and Russian President Vladimir Putin agreed to meet Friday in Alaska and might invite Ukrainian President Volodymyr Zelensky, too.