![head of Ukraine security service](/sites/default/files/multimedia_images_2017/201709eca_ukraine_chief.jpg)
Ukraine's state security service (SBU) chief Vasily Gritsak speaks during a news conference in Kiev, Ukraine, June 6, 2016. © 2017 REUTERS/Valentyn Ogirenko
Ukraine's state security service (SBU) chief Vasily Gritsak speaks during a news conference in Kiev, Ukraine, June 6, 2016. © 2017 REUTERS/Valentyn Ogirenko