While support for Vladimir V. Putin’s threats resounded in pro-war venues, some Russians reacted with worry, gallows humor and apathy to the suggestions of striking the West and using nuclear weapons.

President Vladimir Putin said on Friday that Russia would keep testing its new Oreshnik hypersonic missile in combat and had a stock ready for use, while Ukraine said it was already at work to develop air systems to counter the weapon.

The attack with an intermediate-range ballistic missile has spurred fears of a major escalation in the ongoing war and prompted Ukraine to request new air defenses.