MAKHACHKALA, Russia – Russian President Dmitry Medvedev has made a surprise visit to the violence-wracked southern province of Dagestan, telling authorities to use tougher, "more cruel" measures to fight terrorism. On Thursday, an explosion killed two suspected militants and wounded a third in Dagestan. Police say the men may have been transporting a makeshift bomb. Medvedev told local officials on Thursday "the measures to fight terrorism should be expanded, they should be more effective, more harsh, more cruel". Russia has been struck by two major terrorist attacks this week. On Wednesday, two suicide bombings killed 12 people in Dagestan and on Monday, suicide bombers killed 39 people and injured scores in attacks on the Moscow subway.