A Russian RS-28 Sarmat intercontinental ballistic missile likely failed during a test earlier this month, according to arms experts and satellite imagery from the launch site. Maxar satellite images from Sept. 21 show a crater about 60 meters (200 feet) wide at the launch silo at the Plesetsk Cosmodrome in northern Russia and damage around the area that was not visible in imagery from earlier in the month. It was not clear from the imagery if the liquid-fueled Sarmat failed during a launch or if there was an accident during defueling. “By all indications, it was a failed test. It’s...