U.S. President Donald Trump has given a stunning reply when asked why he was not concerned by Russia, Iran and China's annual joint military exercise. Trump said that the U.S. was more powerful than its adversaries. The “Security Belt-2025” drills kickstarted in the Gulf of Oman, near the Iranian port of Chabahar. It is the fifth joint naval exercise in which Iran, China and Russia are showing off their military ties. Watch for more details.