Key developments on June 27: Ukraine, EU sign security agreement in BrusselsUkraine signs long-term security deals with Estonia, LithuaniaRussian chemical plant reportedly targeted by drone attackUkraine repels Russian troops from eastern Chasiv Yar neighborhood, military saysRussia has sent around 10,000 immigrants who recently received citizenship to join military fighting in Ukraine, official saysPresident Volodymyr Zelensky signed a security agreement with the European Union on June 27 during the EU leaders summit in Brussels. The document was signed by European Council President Charles M…