April 15 – German company RWE AG has started reverse delivery of gas through Poland to Ukraine. According to the agreement the volume of supplied gas may amount to 10 billion cubic meters per year. April 15 – Security Service of Ukraine (SSU) has identified the leader of Russian subversive group, which is operating in Sloviansk. He is Igor Strelkov, the citizen of Russian Federation and special squad officer of Main Intelligence Directorate of the General Staff of the Armed Forces of the Russian Federation. SSU has started criminal inquiry regarding the fact of the ordering of intentional murder by...