"The Russian strikes on Ukrainian civilian targets are basically terrorist attacks. Slava Ukraini!" King tweeted.
Ukraine's Defense Ministry has commented on his tweet, saying that "Russians are more horrific than any monster in your novels."
The famous writer, dubbed the "King of Horror," has supported Ukraine since the beginning of the war unleashed on it by Russia.
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In his posts, King regularly criticizes Russia and its dictator Putin. In addition, back in March, King refused to extend his contracts with publishers to issue his books in Russia.