In the new situation created by the collapse of the Tsarist regime in March 1917, the non-Russian peoples directed their efforts towards the realization of their national goals. Ukrainians, who took an active part in the overthrow of the Tsarist rule in Petrograd, were among the most active in asserting their national aspirations and laying foundations for a new relationship with Russia. Leadership of the Ukrainian national movement was in the hands of the Ukrainian Central Rada. The Rada was formed on March 17, 1917, with the participation of representatives of principal Ukrainian organizations. It established a broader base when the All-Ukrainian National Congress convened in Kiev on April 19–21, 1917. The Congress was attended by 900 delegates and some 600 other participants, representing peasant, professional, military, and cultural-educational organizations, in addition to political parties, municipalities, and zemstvos, within as well as beyond the Ukraine.