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(CNN) -- North Korea on Friday responded to tougher sanctions from the U.N. Security Council with another barrage of vitriol, repeating a vow to ditch all nonaggression pacts with the South. A day after the isolated regime in Pyongyang had threatened a possible "preemptive nuclear attack" -- something analysts say they think it is unlikely and currently unable to do -- its official news agency reeled off a number of agreements with South Korea that it said would no longer apply. It's the latest installment in a week of furious rhetoric from the North, fueled by its anger over the U.N. vote on the new sanctions, a response to the Pyongyang's recent nuclear test, and joint military drills by the United States and South Korea, which take place in the region each year.