"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.
Kolomoisky remanded in custody until July 7 in murder case

A Kyiv court on May 9 authorized an arrest warrant for oligarch Ihor Kolomoisky in a murder case.
He will be in custody until July 7 without the right of bail.
Kolomoisky, one of Ukraine's most infamous business tycoons, was arrested on Sept. 2 for alleged fraud and money laundering related to his oil and gas holdings. He is the wealthiest businessman to have landed behind bars in Ukraine's independent history.
On May 8, the Prosecutor General's Office announced he was also suspected of ordering the murder of the head of a law firm more than 20 years ago in Crimea.
After the lawyer refused Kolomoisky's demands to annul a decision made at a shareholders' meeting, the oligarch allegedly hired contract killers to assassinate him, according to the investigation.
Kolomoisky has denied the accusation.
The National Police, who say they now have "indisputable evidence" of Kolomoisky's guilt in the case, wrote in a press release that the assassination attempt happened in the Crimean town of Feodosia in August 2003.
Four men attacked the lawyer, beating him and stabbing him, according to the investigators.
He survived the attack after his wife intervened and received life-saving medical care, according to the police. The men were later arrested and sentenced to prison.
A separate investigation was opened to determine who ordered the lawyer's murder.
On May 8, Ukrainian law enforcement officially announced that Kolomoisky was suspected of ordering the assassination. If found guilty, he may be sentenced to between 15 years in jail and life imprisonment.
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