The Ukrainian leader also told reporters at a briefing that a Ukrainian delegation meeting officials from its allies in London on Wednesday would have a mandate to discuss a full or partial ceasefire.
"We are ready to record that after a ceasefire, we are ready to sit down in any format so that there are no dead ends," Zelenskiy said in the presidential office in Kyiv.
For Zelenskiy, the ceasefire declared by Russia around Easter Sunday was evidence that it solely depends on Russia to reduce the shelling.
"It will not be possible to agree on everything quickly," he warned, noting numerous highly complex issues such as territory, security guarantees and Ukraine's membership in the NATO military alliance.
He said that Ukraine would not recognise Russia's de jure control of the peninsula of Crimea as part of any deal as such a move would go against the Ukrainian constitution.
Russia seized Crimea in 2014 and later annexed it.
Ukraine, he said, would be ready to partner with the United States to restore the work of the vast Russian-occupied Zaporizhzhia nuclear power plant.
There had been no such formal proposal from the US about that, however, he added.
The talks in London, which are set to bring together officials from the United States, United Kingdom, France, Germany and Ukraine, come amid a flurry of US-led diplomatic efforts to find a way to end Russia's war with Ukraine.
In an apparent change of plan, US Secretary of State Marco Rubio will not be attending the talks in London, a State Department spokesperson said on Tuesday, adding that US Ukraine envoy General Keith Kellogg would attend.
Zelenskiy said he would be happy to meet US President Donald Trump later this week when they attend the funeral of Pope Francis along with other world leaders.
Ukraine, Zelenskiy said, would also step up its diplomatic outreach this week and that he would meet South African President Cyril Ramaphosa as well as the leaders of Spain, Poland and the Czech Republic.
with DPA
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