Russia's communications regulator accused Twitter on Monday of "maliciously" violating Russian law, saying the social media platform had not complied with some of its requests to delete banned content.
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Roskomnadzor said Twitter could be hit with a large fine if it were found guilty of repeatedly failing to delete content prohibited by law.
It cited banned material related to suicides, pornography and drugs.
Twitter did not immediately respond to a Reuters request for comment.
