The Verkhovna Rada of Ukraine has adopted a declaration on more active historical research of tragic events in the middle of the 20th century. With 226 votes required, 243 MPs voted for the declaration of remembrance and solidarity of the Verkhovna Rada of Ukraine and the Polish Sejm. The wording of the declaration reads that Ukraine and Poland pay tribute to victims of World War Two and condemn actions of outside aggressors. It reads that the Molotov-Ribbentrop Pact of 23 August 1939 between the Soviet Union and Germany caused the war and the occupation of Poland by the Soviet Union and Germany. Mass reprisals against people was a consequence. The declaration calls for more active unbiased historical research. It also calls for containing forces that cause disputes in the States. The declaration also reads that the aggressive foreign policy of the Russian Federation, the occupation of Crimea by the Russian Federation, the armed intervention in the east of Ukraine, Russia's violation of basic norms of the international law and agreements signed with Ukraine, waging the hybrid war pose the threat to peace and security of Europe. The declaration also calls for consolidated actions within North Atlantic Treaty Organization (NATO) to meet new challenges. The declaration expresses support to deeper cooperation of NATO with Ukraine and Ukraine's aspiration to join NATO. Initially the declaration was planned a joint declaration of Verkhovna Rada, the Polish Sejm, and the Lithuanian Seimas. However, because of the parliamentary elections in Lithuania and cancellation of the session of the Lithuanian Seimas during the national mourning, it was decided to sign the declaration with Poland. As Ukrainian News Agency earlier reported, the Verkhovna Rada, the Polish Sejm (lower house of parliament), and the Lithuanian Seimas intended to adopt a joint statement on the Volyn tragedy of 1943-1945 on October 20. Foreign Affairs Minister Pavlo Klimkin has called on the parliament and the Sejm of Poland to adopt a joint statement on the Volyn tragedy of 1943-1945. The Polish Sejm has designated July 11 as the National Day of Remembrance for the victims of the genocide committed by Ukrainian nationalists against citizens of the Second Polish Republic in the period of 1943-1945.