"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.
F-16 fighter jet in Ukraine unlikely shot down by 'friendly fire,' NYT suggests
"Friendly fire" from a Patriot missile battery is unlikely to have caused the downing of a U.S.-made F-16 fighter jet, the New York Times reported on Aug. 31, citing two undisclosed senior U.S. military officials.
Ukraine's General Staff confirmed on Aug. 29 that the F-16, which had been recently delivered to the country and was being operated by pilot Oleksii Mes, had crashed while defending against a mass Russian drone and missile attack on Aug. 26. Mes was killed in the crash.
The cause of the accident remains unclear, but early investigation suggests that a Patriot anti-aircraft system shot out the F-16, The Telegraph reported on Aug. 31.
American and Ukrainian investigators are looking at different versions of the crash, including mechanical failure or pilot error, according to the NYT.
Following the F-16 crash, President Volodymyr Zelensky dismissed Ukraine's Air Force Commander Mykola Oleshchuk on Aug. 30. Defense Minister Rustem Umerov said that his removal was not connected to the deadly accident.
Ukraine's Defense Ministry has also established a special commission to investigate the cause of the crash. Oleshchuk said that Ukraine had received a preliminary report from the U.S., which he said is now part of the investigation.
At the same time, Pentagon spokesperson Sabrina Singh said on Aug. 29 that she was "not aware of any assistance or requests for assistance from the Ukrainian side to us about this particular incident."
Singh declined to discuss the crash in more detail, repeatedly saying that such questions should be referred to Ukrainian officials.
Ukraine received its first F-16s at the beginning of August, a year after its allies formed the fighter jet coalition at the NATO summit in Vilnius to support Kyiv with training and aircraft.
Chris York
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