"We agreed that a full and unconditional ceasefire must begin on Monday, May 12, for at least 30 days. We jointly demand this from Russia, and we know we are supported in this by the United States," Zelensky said.
The announcement follows mounting fears that the two nuclear-armed countries were on the brink of engaging in another full-scale war.
Ukrainian media outlet ZN.UA reported on May 10 that their law enforcement sources confirmed an ongoing probe by the National Anti-Corruption Bureau into suspected embezzlement, money laundering and bribery.
Iran is preparing to send Russia Fath-360 short-range ballistic missile launchers, Reuters reported on May 9, citing Western security and regional officials familiar with the matter.
"Ukraine and all allies are ready for a complete unconditional ceasefire on land, in the air, and at sea for at least 30 days, starting as early as Monday," Ukraine's Foreign Minister Andrii Sybiha wrote.
U.S. President Donald Trump has acknowledged in private that Russia is difficult to negotiate with because they "want the whole thing," referring to Ukraine, the WSJ reported, citing sources familiar with the comments.
The visit marks Merz’s first trip to Ukraine, and the first time all four leaders have travelled there together.
A notice about the airspace closure was published on the U.S. Defense Department's NOTAM (Notice to Airmen) website on May 10, as cited by Ukrainian defense news outlet Militarnyi.
"As in the past, it is now for Russia to show its willingness to achieve peace," the EU's statement reads.
Kremlin spokesperson Dmitry Peskov rejected the idea of a 30-day ceasefire between Russia and Ukraine, claiming in an interview with ABC News on May 10 that it would be "an advantage" for Ukraine.
"Our involvement in the war was justifiable, and this belongs to our sovereign rights," North Korean dictator Kim Jong Un said. "I regard this as part of the sacred mission we must execute for our brothers and comrades-in-arms."
The number includes 1,310 casualties that Russian forces suffered over the past day.
Biden aide: Russia prepares pretext for potential invasion of Ukraine

Russia is preparing a pretext for invading Ukraine, U.S. National Security Advisor Jake Sullivan said at a news briefing on Jan. 13, citing intelligence information.
“Russia is laying the groundwork to have the option of fabricating a pretext for an invasion, including through sabotage activities and information operations, by accusing Ukraine of preparing an imminent attack against Russian forces in Eastern Ukraine,” he said. “We saw this playbook in 2014. They are preparing this playbook again. And we will have further details on what we see as this potential laying of a pretext to share with the press over the course of the next 24 hours.”
The statement comes amid speculation that Russia is preparing a new invasion of Ukraine. Russia has amassed over 100,000 troops and conducted exercises along Ukraine's borders.
Talks between Russia and the West over the past week have reached an impasse, with neither willing to budge on Russia’s core demand of preventing Ukraine's potential accession to NATO and pulling NATO members’ forces back from Eastern Europe.
Meanwhile, the U.S. Senate on Jan. 13 failed to pass a Republican-sponsored bill to introduce sanctions on Russia's Nord Stream 2 gas pipeline under the Baltic Sea immediately.
U.S. President Joe Biden has opposed sanctioning the pipeline now, and the Democrats have drafted a separate bill that would impose such sanctions only if Russia launches another invasion of Ukraine.
In December the European Union's parliament also passed a non-binding resolution calling on the most severe economic and political sanctions to be imposed on the Russian economy and leadership in case of a full-scale war.
In particular, the document demanded that Russia be disconnected from the SWIFT banking system, the Nord Stream 2 pipeline project be aborted, while key Russian military and political decision-makers be subjected to harsh sanctions curtailing their capabilities to wage war on Ukraine.
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