KIEV, Ukraine — Ukrainian President Volodymyr Zelensky and U.S. President Donald Trump announced Saturday they will meet in Washington next Monday, after Trump's summit with Russian President Vladimir Putin failed to secure any agreement to end the war in Ukraine.

In a post on X, the Ukrainian said he had a"long and substantive" conversation with Trump on Saturday, after the American leader met with Putin in Alaska. He thanked Trump for the invitation to a face-to-face meeting in Washington on Monday and said they would"discuss all the details about ending the killing and the war."

The Ukrainian president asked Trump to tighten sanctions against Russia if Putin refuses to end the war and reiterated the importance of involving Europe in the negotiations.

"Sanctions are an effective tool. Security must be guaranteed reliably and in the long term, with the involvement of both Europe and the United States. All issues important to Ukraine must be discussed with the country's participation, and no issue, especially territorial issues, can be decided without Ukraine," Zelensky wrote.

Trump, in a post on the Truth Social network, stated that, after the summit, he called several European officials and leaders, the Secretary General of the North Atlantic Treaty Organization (NATO) and Zelensky, and that “they all decided that the best way to end the terrible war between Russia and Ukraine is to reach a direct peace agreement, and not a mere ceasefire agreement, which often does not hold up.”

The US president also said that, after the meeting with the Ukrainian leader, he would schedule another meeting with Putin"if all goes well."

In addition to Zelensky, other European leaders were briefed on the outcome of the meeting between Trump and the Russian president, a European Commission spokeswoman said.

The telephone conversation included, among others, the President of the European Commission, Ursula von der Leyen, the leaders of France, Germany and the United Kingdom, as well as NATO Secretary General Mark Rutte.