Russia and Ukraine have made progress on restoring peace in eastern Ukraine at a Paris summit mediated by Germany and France. In addition to implementing a ceasefire, the two sides also agreed to a prisoner exchange.
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"The sides commit to a full and comprehensive implementation of the cease-fire, strengthened by the implementation of all necessary ceasefire support measures, before the end of the year 2019," according to a joint communique.
The four-way summit with the leaders of Germany and France also led to all sides agreeing to implement an "all for all" prisoner exchange by the end of the year.
Zelenskiy, who met Putin in person for the first time, has made resolving the conflict in the country's east a priority of his presidency.
German Chancellor Angela Merkel said the outcome of the meeting gave renewed momentum to reviving a 2015 peace agreement for eastern Ukraine that has stalled.
"I say very openly, we have a lot of work to do, but my feeling from this meeting here today is that there is goodwill to resolve difficult questions," Merkel told a joint news conference with the leaders of France, Ukraine and Russia.
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Some 13,000 people have died since fighting between pro-Russian separatists and Ukrainian soldiers began in 2014.
The Paris meeting aimed to get a 2015 peace agreement signed by Ukraine and Russia in Minsk back on track. Brokered with help from France and Germany, the accord called for the withdrawal of heavy weapons, the restoration of Kyiv's control over its borders, and wider autonomy and local elections for the separatist regions. The last time the four national leaders gathered in the so-called Normandy format was in 2016.
French President Emmanuel Macron said that Ukraine and Russia failed to agree on a timetable for elections in eastern Ukraine, but that he hoped the two sides could reach a compromise within four months.
"We know there are disagreements on the calendar and phasing and we had a long discussion on it, but we said let's give ourselves four months to articulate the security and political conditions for these local elections," Macron told a news conference.
Zelenskiy wants to adjust the agreement's timeline to allow Ukraine to take back control of its border with Russia before local elections in the separatist regions, rather than afterwards as stipulated in the accord. Moscow has objected to any change to the timeline.
Zelenskiy less optimistic
Despite some progress in the talks, Zelenskiy said he had hoped to achieve more.
"Many questions were tackled and my counterparts have said it is a very good result for a first meeting. But I will be honest, it is very little; I wanted to resolve a larger number of problems," he said after the talks in Paris.
Putin said Ukraine should give autonomy to the rebel-held regions in line with the deal and also approve legislation granting amnesty to the rebels.
Monday's summit built on progress in recent weeks, including a prisoner exchange deal between Ukraine and Russia, and the two countries' pledge to pull back troops from the front lines in eastern Ukraine.