Ukrainian authorities say their air defense system brought down a Russian Kh-55 missile near Kyiv. This is a terrifying development because those are the missiles Russia uses for nuclear warheads. This missile had a dummy warhead. It was not immediately clear whether this was done to test Ukraine’s defenses or whether it was supposed to have carried a conventional explosive instead. But in either case, it is one sign of the growing danger and threat…and one more reminder of how desperately our help is needed right now.