Polish authorities are stepping up security around the main transit hub for foreign military aid to Ukraine over concerns about Russian-backed sabotage operations.

Following the Russian bombings on Kharkiv and Liubotyn in Kharkiv Oblast, which resulted in casualties and destruction, Ukrainian Foreign Minister Dmytro Kuleba stressed the necessity of additional Patriot air defence missiles.

Nataliia Halibarenko, the head of the Ukrainian mission to NATO, believes that sooner or later, a decision on the right of Ukrainian troops to use US weapons to strike targets in Russia will be made.

Nataliia Halibarenko, Ukraine's Ambassador to NATO, has noted "some progress" in discussions on supplying the country's military with additional Patriot air defence systems.

The Polish Ministry of Foreign Affairs has stated that Ukraine's request to shoot down Russian missiles from NATO territory is a matter for discussion.

The New York Times has reported that the White House is debating whether to allow Ukraine to use US-supplied weapons to strike Russian territory, with Secretary of State Antony Blinken urging President Joe Biden to lift the restrictions after a sobering trip to Kyiv.

Commenting on Kyiv's request to allow Ukraine to use US-delivered weapons to strike Russian territory, House Speaker Mike Johnson has said that the US should allow Ukraine to wage war "in the way they see fit."

German Foreign Minister Annalena Baerbock visited a mobile air defence unit near Kyiv during her visit to Ukraine the day before.

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.