Russian forces accelerated scattered attacks on Kyiv, western Ukraine and beyond Saturday in an explosive reminder to Ukrainians and their Western supporters that the whole country remains under threat despite Moscow’s pivot toward mounting a new offensive in the east.

Stung by the loss of its Black Sea flagship and indignant over alleged Ukrainian aggression on Russian territory, Russia’s military command had warned of renewed missile strikes on Ukraine’s capital. Officials in Moscow said they were targeting military sites, a claim repeated — and refuted by witnesses — throughout 52 days of war.