It is "devastating to see these brutal, unjustified attacks on civilian infrastructure across Ukraine," Principal Deputy Press Secretary Olivia Dalton told reporters aboard Air Force One.

The missile attacks, which included use of state-of-the-art Kinzhal hypersonic missiles, killed at least six people, knocked out electricity for many Ukrainians and disrupted power at the Zaporizhzhia nuclear plant. Three others were killed in shelling.