At a meeting of the Committee of Ministers of the Council of Europe on 15 May, participants approved a key decision in the process of launching the Special Tribunal for the Crime of Aggression against Ukraine.

Ukrainian Foreign Minister Andrii Sybiha has announced that the European Union has officially informed the Council of Europe of its intention to join the agreement on the Special Tribunal for the Crime of Aggression against Ukraine.

President Volodymyr Zelenskyy arrived in Romania on 13 May, where he will take part in the Bucharest Nine summit and hold a series of meetings on strengthening Ukraine's defence.

US Secretary of Defense Pete Hegseth has stated during Senate committee hearings that the Pentagon has sent its military personnel to Ukraine to learn how to deploy drones in real combat conditions.

The United Kingdom announced a new package of sanctions against Russia on 11 May over the abduction of Ukrainian children and recent attempts to interfere in upcoming elections in Armenia.

The Council of the European Union on 11 May imposed sanctions on 16 individuals and seven legal entities responsible for the systematic illegal deportation, forced transfer and forced assimilation of Ukrainian minors.

Rustem Umierov, Secretary of the National Security and Defence Council (NSDC), has briefed President Volodymyr Zelenskyy on the results of meetings with US President Donald Trump's special envoys Steve Witkoff and Jared Kushner.

Hungary's new Foreign Minister Anita Orbán, ahead of the EU Foreign Affairs Council meeting on 11 May, stated that her country will no longer use its veto right on European Union policy as an instrument of blackmail and will work to restore the trust of its EU and NATO partners.

European Union countries issued over 10% more Schengen visas to Russian nationals in 2025, with France being the main driver.

One of the drones that entered Latvian airspace on the night of 6-7 May crashed into an empty oil tank.

The Norwegian government has announced that it is contributing NOK 2.8 billion (about US$302.8 million) to the Prioritised Ukraine Requirements List (PURL), a mechanism for purchasing US weapons for Ukraine.

The UK has announced that it is imposing sanctions on 35 individuals and organisations involved in recruiting vulnerable migrants to fight in Russia's war in Ukraine and in manufacturing drones for use in Moscow's illegal war of aggression.

Estonian Foreign Minister Margus Tsahkna has criticised Russia following its latest strikes on Ukraine, amid Kremlin threats to launch a large-scale missile attack on central Kyiv if Victory Day celebrations in Moscow are disrupted.

President Volodymyr Zelenskyy met in Yerevan, Armenia, with European Commission President Ursula von der Leyen on Monday 4 May.

Austria's Foreign Minister Beate Meinl-Reisinger said on Monday 4 May that Vienna has declared three Russian diplomats personae non ‌gratae due to suspected espionage.