The Kremlin vowed Monday to ramp up hostilities on Ukraine in response to what it alleged was a “terroristic attack” on Russian President Vladimir Putin’s property — just a day after President Donald Trump said he was close to producing a deal that would bring peace to the region.

Trump, after a Sunday meeting with Ukrainian President Volodymyr Zelenskyy at Mar-a-Lago, , sounded optimistic about getting closer to a peace agreement. But it was clear Monday that very little has changed as the war — both on the battlefield and in the information space — raged on.

Yuri Ushakov, a top Putin aide, said Monday that an alleged Ukrainian drone strike on the Russian president would trigger “the most serious response.” He also said Putin informed Trump of the attack by phone Monday morning.

The White House, when asked for comment, only pointed to a social media statement from press secretary Karoline Leavitt saying “President Trump has concluded a positive call with President Putin concerning Ukraine.”

Trump told reporters at Mar-a-Lago that he “heard” about the attack, but didn’t know the details. “That would be too bad,” he said. “That would not be too good.” Asked about it a second time, the president sounded more credulous, stating that he was “angry” about any “offensive” attack by Ukraine would jeopardize the peace talks.

Zelenskyy, intent on getting Trump to see Putin as the primary impediment to peace, called the Kremlin’s allegation of a strike on the Russian leader’s residence “a complete fabrication intended to justify additional attacks against Ukraine, including Kyiv, as well as Russia’s own refusal to take necessary steps to end the war.”

Blasting the “typical lying tactics of the Russians,” Zelenskyy noted on X that Moscow has “already struck Kyiv, including the building of the Cabinet of Ministers of Ukraine…Ukraine does not take steps that could weaken diplomacy. Russia always takes such steps. This is one of many things that sets us apart.”

The latest round of acrimony offered further evidence that, for whatever progress Trump and Zelenskyy said they made Sunday on a 20-point peace plan and negotiations about U.S. security guarantees, the two sides are still far apart.

Russia again appears to throw cold water on hopes for a Ukrainian peace deal