Russia is planning to slow access to Twitter Inc. after it announced lawsuits against it and four other social-media companies for not deleting posts about last month’s nationwide protests over the jailing of opposition leader Alexei Navalny.

Russia will slow access to Twitter on all mobile devices and on half of desktop computers because the company failed to remove content related to teenage suicide attempts, pornography and drug use, internet watchdog Roskomnadzor said in a statement Wednesday. It made no mention of the protest-related posts, but said access could be blocked altogether if Twitter doesn’t remove the banned content.

Twitter couldn’t immediately be reached for comment.

Regulators filed court cases against Twitter, Google, Facebook, TikTok and Telegram Tuesday for allegedly failing to delete posts that urged minors to attend the January protests, Interfax reported.

Russia sought to block Telegram several years ago over failure to share encryption information but was unable to make the ban work technically and ultimately backed down.