The reported launch of more missiles by North Korea has been followed by threats of a military strike against their neighbours, South Korea.They come after Soeul joined a U.S.led initiative to intercept shipments suspected of being involved in weapons of mass destruction.An army spokesman has been quoted on the country’s official news agency saying such action will be seen as an infringement on their sovereignty. The latest twist in this stand off comes despite a stern warning from the US.Ian Kelly a State Department spokesman said:“North Korea will pay a price for the path they are on if they don’t reverse that particular course they are on now.” Those words have not altered North Korea’s position. Pak Tok Hun, Deputy Ambassador of North Korea to the UN claimed their actions are not those of an aggressor. “What is important is to put an end to hostile policy. Hostile policy in particular of the United States and Japan. We have no any other intention [than] to defend ourselves,” he said. As the talking and muscle flexing continues in the North, there are also claims from a South Korean newspaper that its neighbour has started making plutonium again. These latest developments all point to the increasing volatility of the peninsula.