The agreement, signed on 21 April 2010 in Kharkiv, Ukraine, by Ukrainian President Viktor Yanukovych and Russian President Dmitry Medvedev and ratified by the parliaments of the two countries on 27 April 2010, aroused much controversy in Ukraine. The treaty was effectively a continuation of the lease provisions that were part of the 1997 Black Sea Fleet Partition Treaty between the two states. Shortly after the annexation of Crimea by the Russian Federation in March 2014, Russia unilaterally terminated the treaty on 31 March 2014.