President Joe Biden says he cautioned China's Xi Jinping on North Korea, a Chinese ally that has recently accelerated tests of ballistic missiles, alarming South Korea and Japan. Biden said he made it clear that the US would take certain defensive actions if North Korea conducted a test. He spoke at the Group of 20 summit in Bali, Indonesia. Follow Bloomberg for business news & analysis, up-to-the-minute market data, features, profiles and more: http://www.bloomberg.com Connect with us on... Twitter: https://twitter.com/business Facebook: https://www.facebook.com/bloombergbusiness/ Instagram: https://www.instagram.com/quicktake/?hl=en