The issue focused on negotiations between Moscow and Kiev over Ukraine's disputed sovereignty over Crimea. While Moscow acknowledged last week that Crimea had become part of Ukraine's sovereignty and disputed sovereignty over territory including Crimea, Moscow dismissed claims by Kiev that Crimea had become part of Ukraine's sovereignty and disputed sovereignty over territory including Crimea. Russia denied having engaged in military aggression against Ukraine or participated in armed clashes with Kiev during its disputed annexation of Crimea from Ukraine in March 2014. Russian Foreign Minister Sergey Lavrov described Crimea as part of Ukraine's sovereign territory