"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.
Armenia threatens to leave Russian-led CSTO

Armenia will leave the Russian-led Collective Security Treaty Organization (CSTO) if the military alliance fails to address Armenia's collective security concerns, Prime Minister Nikol Pashinyan said at a press conference on March 12.
“If the CSTO answers the question of where the organization’s area of responsibility is in Armenia, and this question corresponds to our vision, then we will consider that the issue between us has been resolved. If not, then Armenia will leave the CSTO,” Pashinyan said.
The threat comes amid a growing rift between Yerevan and Moscow, which was exacerbated when Russia and its "peacekeepers" in Nagorno-Karabakh did not prevent Azerbaijan's armed seizure of the region.
According to Article 4 of the CSTO Treaty, if a member state experiences aggression, then all members states must come to its aid - similar to NATO's Article 5 principles.
The CSTO did not intervene during Azerbaijan's offensive in September 2023.
Pashinyan said in February that Armenia had "frozen" its participation in the Russian-led Collective Security Treaty Organization (CSTO) because it failed to uphold its objectives regarding Armenia.
In recent months, Armenia has further sought to distance itself from Russia - repeatedly accusing Moscow of being an unreliable partner.
Last week, Armenia's Foreign Minister Ararat Mirzoyan revealed that the country is considering applying for membership in the European Union, aiming to strengthen ties with the West. Yerevan also asked Russian "peacekeepers" who have been stationed at Yerevan's international airport since the country's independence to leave.
Since coming to power in a 2018 revolution, the government of Armenian Prime Minister Nikol Pashinyan has steadily deepened the country's ties with the West while drawing condemnation from Russia. Pashinyan and other Armenian officials have sought to foster security ties with other countries, such as France, the U.S., or India.
In January 2024, Armenia joined the International Criminal Court becoming one of 124 countries obliged to arrest Russian President Vladimir Putin if he steps foot in national territory. The Kremlin decried the move as an "unfriendly step" and "the wrong decision."
The CSTO, which was established in 2002, includes Russia, Armenia, Belarus, Kazakhstan, Tajikistan, and Kyrgyzstan.

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