The air defense system worked in Donetsk on Friday evening, explosions were heard in the sky above the city. Ukrainian Foreign Minister Dmitry Kuleba said that the expected counterattack of the Ukrainian Armed Forces should not be considered the last war. The official representative of the UN Secretary-General, Stephane Dujarric, called for non-attack on civilian infrastructure and civilians. The events of April 28 in the history of socialbites.ca.