Konstantin Kosachev, writing on the Telegram messaging app, said the only thing Ukraine could count on was an improvement in Russian-US ties.

He derided the outcome of the London meeting as “a desperate attempt to pass off as success the failure of a 10-year policy of inciting Ukraine towards Russia by the same Great Britain and, until recently, the US”.

“Europe has no plan,” wrote Kosachev, head of the foreign affairs committee of Russia’s upper house of parliament.

“And if Ukraine should count on something, it can only be on progress (if there is any to come) in Russian-American relations.”

He said Ukrainian President Volodymyr Zelensky and British Prime Minister Keir Starmer, who hosted the meeting, “cannot fail to understand this”.

Leonid Slutsky, chairman of the lower house’s committee on international affairs, said the meeting would not save Zelensky’s position two days after his talks in Washington with President Donald Trump broke down in acrimonious exchanges.

“The London summit will not save the ringleader of the Ukrainian Nazis,” Slutsky wrote on Telegram. “Zero results, a failed attempt to restore the clown’s political reputation after his resounding failure in Washington.”

Former Russian President Dmitry Medvedev, now a senior security official, dismissed the London gathering before it had ended, describing it on X as a “coven… to swear allegiance to the Nazi nobodies in Kiev” and a “shameful sight.”

Starmer, speaking after the meeting, said participants had agreed to draw up a Ukraine peace plan to take to the US. Starmer said Britain, Ukraine, France and other nations would form a “coalition of the willing” to produce a plan.

Zelensky said he felt strong support from Europe. He said he could salvage his relationship with Trump but that talks needed to continue in a different format.