Act Zluky is signed, unifying the Ukrainian People's Republic and the West Ukrainian National Republic.

The Unification Act (Ukrainian: Акт Злуки, romanized: Akt Zluky, IPA: [ˈɑkt ˈzlukɪ], "Act Zluky" or Велика Злука, Velyka Zluka, IPA: [ˈvɛlɪkɑ ˈzlukɑ]) was an agreement signed on 22 January 1919, by the Ukrainian People's Republic and the West Ukrainian People's Republic on the St Sophia Square in Kyiv. Since 1999 the Day of Unity of Ukraine, celebrated every year on 22 January to mark the signing of the treaty, is a state holiday; but not a public holiday.