The powerful sister of North Korean leader Kim Jong-un on Tuesday demanded that South Korea admit and apologize for a provocation violating its sovereignty after Pyongyang blamed Seoul for drone incursions. Kim Yo-jong made the demand in a statement following the North Korean military's claim last Saturday that Seoul sent drones carrying surveillance equipment across the border to the North in September and on Jan. 4, calling it a violation of its sovereignty. "The Seoul authorities should admit and apologize for having violated the sovereignty of the DPRK and take a measure for preventing reoccurrence," Kim said in the statement carried by the Korean Central News Agency (KCNA). DPRK stands for the Democratic People's Republic of Korea, the official name of North Korea. Kim called the alleged sovereignty breach a "deed done by the enemy only." She warned Seoul would be "forced to pay the price they cannot deal with," if such provocations are repeated. "Our reaction to the infringement on sovereignty and our will to defend the sovereignty will not be confined to the proportional response or