"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.
Russian attacks against Ukraine kill 4, injure 9 over past day

Russian strikes against Ukraine killed at least four people and injured at least nine over the past day, regional officials said early on April 8.
Russian attacks against Donetsk Oblast on April 7 killed one person in Chasiv Yar and injured one in Yelyzavetivka, Governor Vadym Filashkin reported.
Russia attacked the city of Kharkiv around noon on April 7 with aerial bombs, injuring a 45-year-old man with shrapnel, Governor Oleh Syniehubov reported.
Four women were treated for shock following the attack. Russian forces later struck the city with an S-300 missile, damaging buildings but inflicting no casualties.
In Kherson Oblast, Russian attacks injured three people, Governor Oleksandr Prokudin said. Six houses were damaged, as well as a critical infrastructure site, a shopping center, and other civilian property.
Russian "kamikaze" drones attacked a critical infrastructure facility in Zhytomyr Oblast, the regional military administration said.
The Zviahel City Council reported a "direct threat of air pollution" as a result of the damage, urging residents to stay indoors and close their windows. No casualties were reported.
Zhytomyr Oblast Governor Vitalii Bunechko said later for Radio Free Europe/Radio Liberty that no air pollution has been recorded in the region at the moment, adding that the measures taken by the Zviahel authorities are "preventive."

In Sumy Oblast, one person was injured in a Russian artillery strike against the Myropillia community, the regional military administration reported.
Russia struck eight settlements in Zaporizhzhia Oblast over the past day, the regional military administration said. Three people were killed and three injured in a Russian rocket attack against the Polohy district, according to the statement.
Overnight drone attack against the Voznesensk district in Mykolaiv Oblast damaged power lines, leaving 14 settlements without power, Governor Vitalii Kim reported, adding that there were no casualties.
In the Odesa district of Odesa Oblast, Russian drones damaged a transport facility and a gas station but inflicted no casualties, Governor Oleh Kiper said.
Dnipropetrovsk, Kirovohrad, Luhansk, and Khmelnytskyi oblasts also came under attack, but no casualties were reported.
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