"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.
"We have a plan B and a plan C. But our focus is plan A, the essence of which is to get everyone's support" for Ukraine's accession, EU foreign policy chief Kaja Kallas said.
At least 3 killed, 9 injured in Russian attacks against Ukraine over past 24 hours

At least three people were killed and nine others injured in Russian attacks against Ukraine over the past day, according to local authorities.
Russian forces shelled settlements in Donetsk Oblast 18 times over the past day, according to Governor Vadym Filashkin. Two people were killed and another five were injured, and multiple incidents of property damage were reported.
At least four people were injured and one person was killed in Russian attacks on Kherson Oblast, Governor Oleksandr Prokudin reported on April 20, with attacks reportedly occurring after Russia's alleged Easter ceasefire was supposed to come into effect.
Around 6 p.m., 7:05 p.m., and 7:12 p.m. local time there were targeted FPV drone strikes on parts of Kherson, Urozhaine, and Stanislav, according to Prokudin.
Eight FPV drones struck a district of Kherson, setting several apartments on fire. In Urozhaine, a drone hit a civilian vehicle, and another later targeted the village. An additional FPV drone was reported to have struck Stanislav, though Prokudin provided no further details.
"This is yet another reminder that Russia holds nothing sacred — and trusting the occupiers’ words is to risk your life," Prokudin said.
Russia's alleged Easter ceasefire was supposed to come into effect at 6 pm on April 19 and last until midnight on April 21.
"We assume that the Ukrainian side will follow our example," Russian President Vladimir Putin said, adding that the ceasefire would "test Ukraine's sincerity in pursuing peace talks."
However, reports are also emerging from the front line of Russian ceasefire violations.
President Volodymyr Zelensky reported on April 20 that Russian forces had carried out 387 shellings and 19 assault operations across Ukraine between 6 p.m. and midnight. He added that drones had been used at least 290 times during that period.

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