U.S. President Joe Biden said Thursday he was prepared to speak with Vladimir Putin if the Russian president shows an interest in ending the war in Ukraine, and only in consultation with NATO allies.

"I have no immediate plans to contact Mr. Putin," Biden said at a White House news conference after talks with French counterpart Emmanuel Macron, who has maintained dialogue with the Russian leader.

"I’m prepared to speak with Mr. Putin if in fact there is an interest in him deciding he’s looking for a way to end the war. He hasn't done that yet," he said.

Biden and Macron pledged their countries’ solidarity with Ukraine against Russia’s war and vowed to work together to deal with the economic difficulties the conflict has brought.

"We reaffirm that France and the United States together, with all our NATO allies and the European Union and the G-7, stand as strong as ever against Russia’s brutal war against Ukraine," Biden said.

He put the onus on ending the war, which began with Russia’s invasion of Ukraine in February, squarely on Putin.

"There’s one way for this war to end, the rational way: Putin could pull out of Ukraine, No. 1. It appears he's not going to do that. He's paying a very heavy price for failing to do it."