In the race to weaponize AI, will humanity be the loser?

Defense Advanced Research Projects Agency (DARPA) recently announced a $2 billion investment in AI related research while Department of Defense (D0D) created a Joint AI Center to accelerate the AI in defense. On the other hand, China has a big ambition with a plan to lead the AI field by investing $1 trillion by 2030. Similarly, Vladimir Putin has publicly said that "the nation that leads in AI will be the ruler of the world." As the world superpowers are gearing up for AI arms race, how does that impact the whole humanity? Will it create a better future for us or lead to our doom?