“Congratulations to the Latvian friends on the Restoration of Independence Day”, President Petro Poroshenko posted at Facebook.
The Restoration of Independence Day in Latvia is annually celebrated on May 4. On this day in 1990, the Declaration "On the Restoration of Independence of the Republic of Latvia" was approved by the Supreme Soviet of the-then Latvian SSR. It stated that although Latvia had de facto lost its independence in 1940, when it was annexed by the Soviet Union, the country had de jure remained a sovereign country as the annexation had been unconstitutional and against the will of the people of Latvia.
Therefore the document resolved that the Molotov–Ribbentrop Pact and the Soviet occupation of Latvia in 1940 were illegal, and annulled the declaration on the accession of Latvia to the Soviet Union of 21 July 1940, re-instituted the Constitution of Latvia of 1922, which was thereupon partly suspended, and set a period of transition to de facto independence.
In September 1991, the Soviet Union eventually recognized Latvia’s independence.