Russia launched a major ballistic missile assault on Kyiv late Saturday, carrying out Moscow’s explicit vow to punish Ukraine for a deadly strike in the occupied east. The barrage shook the capital’s government district and sent residents fleeing into metro stations as sirens warned of an ongoing threat. The strikes are a retaliatory response to Ukrainian bombardments in Russian-occupied Luhansk, which Russia says destroyed a student dormitory, killing 18 people, according to the Russian emergency ministry.