Armed conflicts and attacks

• Russian invasion of Ukraine
  • Two people are killed and three others are injured in a "record drone attack" on Kyiv. Ukrainian authorities claim to have shot down 52 of 54 drones. (Euronews)
• Kivu conflict
  • Two people are killed by a shooting near Rwindi, North Kivu, Democratic Republic of the Congo. (Reuters)
• 2023 Manipur violence
  • Thirty three people are killed by ethnic clashes in Manipur, India. (Reuters)

Politics and elections

• 2023 Turkish presidential election
  • Citizens in Turkey head to the polls to vote in the second round of the presidential election. (AP)
• Local and regional elections are held in Spain. (El País)
• Somalia announces that starting next year, Somalis will change to a presidential system and elect their officials via direct vote, ending more than three decades of indirect voting where lawmakers elected the country's leaders with approval of clan and elderly leaders. (Reuters)

Sports

• 2023 IndyCar Series, 2023 Indianapolis 500
  • Two-time series champion Josef Newgarden wins the 107th Indianapolis 500.

May 28: Republic Day in Armenia (1918); Independence Day in Azerbaijan (1918)

• 621 – Tang forces led by Li Shimin defeated and captured Dou Jiande at the Battle of Hulao in the civil war that followed the collapse of the Sui dynasty.
• 1892 – Scottish-American preservationist John Muir (pictured) founded the environmental organization Sierra Club in California.
• 1940 – Second World War: Belgium surrendered to Nazi Germany, ending the Battle of Belgium.
• 1987 – Mathias Rust, a West German aviator, flew his Cessna 172 from Helsinki, Finland, through Soviet air defences, landing illegally near Red Square in Moscow.
• 2010 – A train derailment and collision in the West Midnapore district of West Bengal, India, caused the deaths of at least 148 passengers.