US President Donald Trump said Wednesday that there will be “very severe consequences” if Russian President Vladimir Putin does not agree to stop his war in Ukraine after their Friday summit in Alaska, though he did not say what those consequences might be.

Trump’s comment came after a virtual meeting with European leaders, including Ukrainian President Volodymyr Zelensky, who told the group that Putin “is bluffing” about seeking peace.

“He is trying to apply pressure before the meeting in Alaska along all parts of the Ukrainian front. Russia is trying to show that it can occupy all of Ukraine.”

German Chancellor Friedrich Merz said the leaders had a “constructive and good” discussion with Trump.

Trump and Putin will meet in Alaska on Friday, where Kyiv and its allies are worried the two leaders may try to dictate the terms of peace in the 3-1/2-year war.

“He is trying to apply pressure before the meeting in Alaska along all parts of the Ukrainian front. Russia is trying to show that it can occupy all of Ukraine.”

Trump and Putin meeting at an American military base this week allows them to avoid any protests and provides an important level of security.

That’s according to Benjamin Jensen, senior fellow for defense and security at the Center for Strategic and International Studies, a Washington-based think tank.

“For President Trump, it’s a great way for him to show American military strength while also isolating the ability of the public or others to intervene with what he probably hopes is a productive dialogue,” Jensen said.

He said the location means Trump can cultivate ties with Putin while “signaling military power to try to gain that bargaining advantage to make a second meeting possible.”