Klaus Iohannis, President of Romania, has stated that a possible supply of a Romanian Patriot system for Ukraine must be approved by the Supreme Council of the National Defence, but it must not lead to a weakening of Romania's air defence.

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.

President Volodymyr Zelenskyy had a telephone conversation with Austrian Chancellor Karl Nehammer on 22 May.

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.

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.

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.

A sculpture dedicated to the 75th anniversary of the North Atlantic Alliance was unveiled on European Square in Kyiv on 16 May.

Representatives from 50 of the 160 countries and organisations who were invited to the Global Peace Summit in Switzerland have confirmed their attendance.

The account of Slovak Prime Minister Robert Fico has released a formal statement regarding  the assassination attempt on the official; the post states that he is in a "life-threatening" condition.

US Secretary of State Antony Blinken has stated that a potential bilateral security agreement with Ukraine will give military assistance in a variety of sectors, bringing the country closer to NATO membership.

During a telephone conversation with Ukrainian President Volodymyr Zelenskyy on 14 May, French leader Emmanuel Macron condemned Russia’s recent ramping up of attacks against Ukraine and said France would send additional weapons to Ukraine in the near future.

It has been revealed that the future security agreement between the EU and Ukraine will determine the forms of aid for Ukraine in the security and defence sector, as well as the mechanism of consultations in the event of future aggression.

US President Joe Biden signed a decree on 10 May to provide Ukraine with military aid worth up to US$400 million.

The United States will announce a new US$400 million military aid package for Ukraine on Friday, 10 May.

Ukraine would receive the first batch of F-16 fighter jets "within weeks" as the UK newspaper Evening Standard reported on 10 May with reference to a "high-ranking military source".