KYIV, Ukraine — A series of blasts rocked the capital, Kyiv, and other major Ukrainian cities when they were hit Monday morning by a barrage of Russian missiles that President Vladimir Putin described as punishment for an explosion Saturday on the Crimean Bridge.In Moscow, where he convened a meeting of his Security Council, Putin boasted of a “massive strike” using high-precision weapons in retaliation for the bridge explosion, and he warned of further strikes if Ukraine continued to hit Russian targets.Across the country, approximately 70 sites were damaged, including 29 critical infrastructure objects, such as power and heating stations, 35 private residential buildings and four high-rise buildings, said Ihor Klymenko, Ukraine’s national police chief.“We are dealing with terrorists.” “Always remember,” he added, “Ukraine existed before this enemy appeared, and Ukraine will exist after it.” Russia’s strikes in the heart of the capital raised questions about the strength of Ukraine’s air defenses, which officials have been pushing Western countries to bolster through additional security assistance.Kyiv has not publicly claimed responsibility for the bridge explosion, but a Ukrainian government official told The Washington Post that Ukraine’s special services carried out the operation."