"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.
Ombudsman appeals to UN, Red Cross over alleged execution of Ukrainian POW by Russia seen on video

Ukraine's Ombudsman Dmytro Lubinets said on Sept. 6 that he had appealed to the International Committee of the Red Cross (ICRC) and the United Nations in response to a video that allegedly shows the execution of a Ukrainian prisoner of war (POW) by Russia.
The video, which is circulating on social media, was published by Ukraine's military intelligence's "I Want to Live" project. It is unknown when and where it was filmed.
The footage purportedly shows a Russian soldier who asks a Ukrainian soldier if he wants to "say the last word, pray before dying," and then shoots him with a rifle three times. The moment of the shooting is blurred. The Kyiv Independent was unable to verify the video.
There have been multiple reports of Ukrainian POWs being tortured or killed while in Russian captivity since the start of Russia's full-scale war against Ukraine. As of June, the Prosecutor General's Office said 28 criminal investigations were underway regarding the execution of 62 Ukrainian POWs.
Following new reports, Lubinets reiterated that the execution of Ukrainian POWs by Russia is a violation of the Geneva Convention relative to the Treatment of Prisoners of War.
"Each such execution requires a proper investigation, and the international community should not remain silent on the systemic crimes of the occupiers," he said.
According to the ombudsman, Russia deliberately shoots Ukrainian POWs and shares such videos, but all information must be thoroughly verified.
Earlier in the day, CNN published a video showing how Russian forces seemed to have gunned down a group of surrendering Ukrainian soldiers near Pokrovsk in late August.
Prosecutor General Andrii Kostin said in June that Russian commanders had given orders "not to capture Ukrainian servicemen, but instead to kill them with inhuman cruelty." He made the statement after footage was revealed that showed a Ukrainian soldier beheaded by Russian troops.
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