Pakistan has taken umbrage with a pair of NATO airstrikes that it says violates its sovereignty. The strikes, which occurred on Saturday, took place after insurgents based in Pakistan attacked an Afghan outpost in Khost province, which is across the border from Pakistan. Over 50 militants were killed. On Monday, the Pakistan Ministry of Foreign Affairs said that NATO did not have authority to have foreign troops on its soil and airspace, and that it will “consider response options” unless corrective measures are implemented. NATO says that airstrikes were justified because they were done in self-defense.