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The President will make his speech at a joint meeting of the House of Representatives and the National Assembly.
He died on April 16.
The situation is under control now, the Ukrainian authorities say.
The Night Wolves regained control over the hacked page several hours later.
Previously, it was assumed that the address will take place on April 22, but the event was postponed.
The summit will be held in Riga on 21-22 May.
Political prisoner could get transfered to prison.
At least 15 policemen have been injured in clashes with protesters.
The billboard dated for the Victory Day was installed in Ivanteyevka, Moscow Oblast.
