Both Ms. Merkel and Mr. Hollande planned to fly out of Moscow immediately, Mr. Peskov said.

The Ukrainian position underscored the formidable obstacles to an accord to end the fighting between Ukraine and Russian-backed separatists that has killed more than 5,000 people and displaced more than one million, the worst violence on the European Continent since the Balkan wars of the 1990s.

Mr. Putin, in letters this week to Mr. Hollande, and the Ms. Merkel, put forward a proposal that apparently included shifts in the cease-fire boundaries based on recent gains by pro-Russian separatist fighters, diplomats said. The proposal also included a plan to grant political autonomy to the embattled regions of Donetsk and Luhansk.

Western officials briefed on Mr. Putin’s plan described it as a nonstarter that would turn eastern Ukraine into another post-Soviet frozen-conflict zone, like Abkhazia along the border with Georgia or the pro-Russian breakaway Transnistria region of Moldova, where the Kremlin maintains several thousand troops, ostensibly as a peacekeeping force.

In a television interview shortly after Mr. Hollande and Ms. Merkel met with Mr. Poroshenko of Ukraine for five hours on Thursday night, a senior Ukrainian official said the leaders were focused entirely on carrying out the lapsed accord.

Contrary to Mr. Hollande’s statement on Thursday that he and Ms. Merkel were headed to Kiev, the Ukrainian capital, to present a new proposal, the Ukrainian official, Valeriy Chaly, who is Mr. Poroshenko’s senior aide on foreign affairs, said the European leaders arrived with no new plan and instead the meeting focused on the need to put in effect the provisions of the Minsk truce.