Members of the Ukrainian Interior Ministry's special battalion Kiev-1 take part in an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 take part in an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 take part in an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

A mock terrorist is detained by members of the Ukrainian Interior Ministry's special battalion Kiev-1 during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 aim their weapons during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 take part in an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 take part in an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 storm a building during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 storm a building during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

A mock terrorist is detained by members of the Ukrainian Interior Ministry's special battalion Kiev-1 during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

A mock terrorist detains a hostage as members of the Ukrainian Interior Ministry's special battalion Kiev-1 rappel down a building during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 rescue a hostage, who was detained by a mock terroist, during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 rescue a hostage, who was detained by a mock terroist, during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 detain a mock terrorist during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 stand in line as they take part in an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 take part in an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 detain mock terrorists during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)