A new kind of cold war is here. Military forces around the globe are in a covert arms race to develop terrifying new AI weaponry, a new documentary exploring the future of artificial intelligence in battle reveals. “World leaders in Russia and China, people in the US military have said, whoever gets the advantage in AI is going to have an overwhelming technical advantage in war,” Jesse Sweet, director of “UNKNOWN: Killer Robots, premiering Monday on Netflix, told The Post. “This revolution is happening now, but I think our awareness [is] lagging behind,” Sweet, an Emmy Award-winning filmmaker and producer,…