"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.
Zelensky proposes Ukraine-Balkans defense industry forum

President Volodymyr Zelensky proposed to hold a special Ukraine-Balkans defense industry forum to tighten cooperation and boost Ukraine's production capacities. He made the announcement during a Ukraine-Southeast Europe summit in Tirana on Feb. 28.
The event could be held in Kyiv or in one of the other capitals of participating countries, the president suggested.
Zelensky arrived in Tirana late on Feb. 27 to attend the second Ukraine-Southeast Europe summit, marking his first visit to Albania since the start of the full-scale invasion.
"We are proud that there are about 500 defense companies operating in Ukraine in different areas, and each of them adds strength. But it is not enough to win over (Russian dictator Vladimir) Putin," Zelensky said in his speech at the summit.
"We see the problems with the supply of ammunition – which are affecting the situation on the battlefield. And we are interested in co-production with you and all our partners."
Ukraine faces increasingly critical ammunition shortages as assistance from the U.S. has been delayed for months due to domestic political disputes while European allies struggle to fill the gap.
Seeking international support waver, Kyiv has been seeking to localize domestic defense production, inviting foreign companies to set up shop in Ukraine.
Speaking to the summit, Zelensky stressed that the "equal right of nations to security and independent choice of their destiny should be universal principles."
Ukraine's head of state appreciated the cooperation with the Balkan countries on transport and infrastructure, the joint work in the Black Sea and the Danube region in the context of food security, and support against Russian aggression.

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