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.

European leaders urged more “pressure” on Russia overnight Saturday, after the announcement of a Trump-Putin summit to end the war in Ukraine raised concern that an agreement would require Kyiv to cede swathes of territory.