Of 81 missiles fired, six were hypersonic weapons, among Russia’s newest and most advanced, which are all but impossible to shoot down. The attacks killed at least nine people.
An armed group said it briefly took control of a border town in Russia’s Bryansk region, but what actually took place there was shrouded in conflicting claims.
The strikes have been one of the most intriguing, and opaque, new elements of the recent fighting. But when it comes to confirming their origins, “we don’t say yes and we don’t say no,’’ said the official.