In June 2009, the head of the Ukrainian Security Service said that after December 13, 2009, all officers from the Russian Federal Security Service (FSB) represented at the (Russian) Black Sea Fleet would be required to leave Ukraine. From then the Security Service of Ukraine would ensure the security of the (Russian) Black Sea Fleet and Russian sailors on Ukrainian territory. However, according to the Russian Foreign Ministry the employees of the FSB, working at the Black Sea Fleet facilities, were to remain on Ukrainian territory "in line with bilateral agreements". In 2010, based on an agreement between Ukrainian and Russian governments military counterintelligence officers from the Federal Security Service returned to the (Russian) Black Sea Fleet base.