KIM Jong-un and Vladimir Putin have sent a chilling warning to the West as they vowed to form a "New World Order". North Korea said it has agreed to further strategic and tactical cooperation with Russia as both countries ramp up a united front against the United States. North Korea has been aggressively tightening ties with Russia especially after Kim Jong-un's September visit to Russia for a summit with Putin. The United States, South Korea and Japan have responded by strengthening their combined military exercises, nicknamed invasion rehearsals by Kim portrays as invasion rehearsals. And veteran Russian MP Alexander Osovtsov said World War Three has already begun for the West's enemies and "we're all participating in it".