High-level delegations from the U.S. and Russia began talks in Saudi Arabia on Tuesday over the fate of Ukraine, the negotiations taking place without Ukrainian participation.

Ahead of the talks that the State Department said were aimed to discuss ending the now three-year-long war, an American delegation headed by Secretary of State Marco Rubio met with Saudi Arabian Crown Prince Mohammed bin Salman.

Rubio’s counterpart, Russian Foreign Minister Sergei Lavrov, confirmed the bilateral talks would take place in Riyadh on Tuesday.

The talks between Moscow and Washington end a period of some three years — since President Joe Biden and Russian President Vladimir Putin met in Geneva before Russia invaded Ukraine — without senior-level engagement between the two nations.

Lavrov and Rubio talked on the phone Saturday, according to the State Department, after a conversation between Putin and President Donald Trump last week.

While a spokesman for Putin said the meeting would be “devoted” primarily to “restoring the entire range of Russian-American relations,” State Department spokeswoman Tammy Bruce said that the meeting would be more narrowly focused on the “larger issue of Ukraine.”

After the Trump-Putin conversation, Bruce called the meeting the “second step to determine if the Russians perhaps are serious, and if they’re on the same page.”

Zelenskyy said Monday Ukraine ‘will not recognize agreements’ struck without Kyiv’s participation

Ukrainian President Volodymyr Zelenskyy was not invited to the meeting. Zelenskyy said Monday that Ukraine “cannot acknowledge any … agreements about us without us, and will not recognize such agreements.”

“Earlier, during the war, it was considered taboo to talk to the aggressor,” the Ukrainian president said.

Amid the flurry of diplomatic activity, French President Emmanuel Macron convened a meeting of European heads of government in Paris Monday ahead of the U.S.-Russia engagement.

Macron and Trump spoke via telephone for nearly 30 minutes prior to the European meeting, a White House official said. The official called the conversation “friendly” and said it included discussion of the war in Ukraine and the U.S.-Russia bilateral meetings Tuesday.

Mike Waltz, the White House national security adviser, said on Sunday he would “push back on … any notion that [Ukrainians] aren’t being consulted.”

“They absolutely are. And at the end of the day, though, this is going to be under President Trump’s leadership that we get this war to an end,” Waltz said, conceding “they may not like some of the sequencing that is going on in these negotiations.”

Zelenskyy himself was in the Middle East, where he met with officials in the United Arab Emirates Monday, with Tuesday meetings scheduled Saudi Arabia and Turkey. In Riyadh, Zelenskyy said he’d ask Salman — colloquially known as MBS, who is the country’s de facto leader, crown prince and prime minister — about the U.S.-Russia meetings.

The opening of White House-facilitated talks on peace in Ukraine came after Trump officials signaled potential terms for a deal in the lead up to, and during, the Munich Security Conference in Germany last week.

Ahead of the conference, Defense Secretary Pete Hegseth called a return to Ukrainian borders before Russia’s 2014 invasion of Crimea “unrealistic.” That “illusionary goal” — and NATO membership for Ukraine — would not be promoted by the U.S., the secretary said.

Zelenskyy told Munich attendees that Ukraine must be assured of membership in “NATO, or a reliable alternative.”

He called for the building of the “armed forces of Europe” as the Trump administration presses for more European spending on defense.

Among the attendees of Macron’s hastily organized meeting in Paris, the prime ministers of the United Kingdom and Sweden said they would be open to contributing armed forces on the ground in Ukraine in a peacekeeping capacity after a potential deal is struck.

“If there is a peace deal [for Ukraine], and everybody wants a peace deal, then it’s got to be a lasting peace deal, not just a pause for Putin to come again,” U.K. Prime Minister Keir Starmer said in Paris.

“There’s also a wider piece here which is the collective security and defense in Europe, and here, I think we’ve got a generational challenge. We’ve all got to step up,” he added.

–ABC News’ Molly Nagle and Patrick Reevell contributed to this report.