The Swiss Federal Council issued an order on 22 May on enhanced security measures during the Ukraine Peace Summit in the resort of Bürgenstock on 15-16 June.

UK Defence Secretary Grant Shapps on Wednesday accused China of providing or preparing to provide lethal weaponry to Russia for use in the war against Ukraine.

The Swedish government has planned additional military support for Ukraine, totalling SEK 75 billion (US$7.01 billion) over three years.

On 21 May, German Foreign Minister Annalena Baerbock examined of Ukraine's largest thermal power plants that had been destroyed by a Russian missile strike.

Annalena Baerbock, Minister of Foreign Affairs of Germany, has had to cancel her visit to the city of Kharkiv planned within her trip to Ukraine on 21 May due to the security situation.

Lithuanian Foreign Minister Gabrielius Landsbergis believes that Ukraine's Western allies should allow the Ukrainian military to strike targets in Russia.

On 21 May, the EU Council approved the transfer of proceeds from taxable excess profits of frozen Russian assets to Ukraine.

The US "fundamentally" wants Ukraine to win the war against Russia, said Matthew Miller, the spokesperson for the US Department of State, during a briefing.

Ten Ukrainian servicemen have completed F-16 fighter jet maintenance training in the Netherlands.

The United States has sent 59 transformers and other equipment to Ukraine for Kharkiv, which is being subjected to regular air attacks from the Russian Federation.

Latvian Foreign Minister Baiba Braže, who ran her first half marathon to raise funds for drones for Ukraine, announced on Tuesday morning that she had already raised €13,500, and the amount continues to grow.

A German initiative to strengthen Ukraine's air defence has raised almost a billion euros for this goal.

German Foreign Minister Annalena Baerbock arrived in Kyiv on 21 May on her seventh visit since the beginning of Russia's full-scale invasion of Ukraine.

Ukraine has a right to strike military targets on Russian Federation soil, and the US and its allies should support the country in doing so, said Victoria Nuland, former US Deputy Secretary of State, in an interview with ABC News after Russia's offensive in Kharkiv Oblast.

The European Commission has commented on the latest Russian air attack on Kharkiv and the surrounding oblast, which killed more than 10 civilians, including a pregnant woman.

UK Defence Secretary Grant Shapps has commented on Russia's problems with labour shortages caused, in particular, by mobilisation for the war of aggression against Ukraine.

On 20 May, US Secretary of Defence Lloyd Austin launched the 22nd meeting of the Ukraine Defence Contact Group (also known as the Ramstein format), underlining the importance of ensuring a long-term supply of weaponry to Kyiv.

Estonian Prime Minister Kaja Kallas has said the Baltic states should convey to Western countries the opinion that peace on Russian terms will not mean an end to human suffering.

Estonian Prime Minister Kaja Kallas has stated that some countries have already sent their instructors to Ukraine to train Ukrainian military personnel.

Bulgarian President Rumen Radev has called Ukraine's victory over Russia "impossible" and linked the war to an assassination attempt on Slovak Prime Minister Robert Fico.

Ukraine is waging a defensive war and therefore should have the right to use partner-supplied weapons to strike places from which Russia launches its attacks, stated Ukrainian Ambassador to the United States Oksana Markarova.

Jean-Louis Bourlanges, Chairman of the French National Assembly Foreign Affairs Committee, has called on the French authorities to allow Ukraine to launch strikes with French-supplied weapons on Russian territory.

Hungarian Foreign Minister Péter Szijjártó has said that he has vetoed the Council of Europe's decision to recognise and support only one peace plan for Ukraine – President Volodymyr Zelenskyy's Peace Formula.

On 17 May, the Council of the European Union decided to suspend the broadcasting of four more media outlets that spread and support Russian propaganda and support the war of aggression against Ukraine: Voice of Europe, RIA Novosti, Izvestia and Rossiyskaya Gazeta. 

The offensive activity of the Russian Armed Forces in Kharkiv Oblast suggests that they seek to create a buffer zone, not capture the city of Kharkiv.

German Foreign Minister Annalena Baerbock, commenting on the Russian military offensive in Kharkiv Oblast, has stated that Ukraine needs to be provided with long- and medium-range weapons.

US senators are divided in their opinion on whether Ukraine should use US-provided weapons to strike Russian territory, especially amid a new Russian offensive in Kharkiv Oblast.

The Pentagon stated that they have not changed their position regarding Ukraine's use of the weapons provided by the US as part of its military assistance.

Nikos Dendias, Minister of National Defence of Greece, has denied media reports that Greece has secretly sent 250 containers with weapons to Ukraine.