Twitter acknowledged that its service was being blocked for certain individuals in Russia in a message on Saturday, and said it was striving to make the site secure and accessible.

One day after Russia invaded Ukraine, Moscow said that it was restricting access to Meta Platforms Inc’s Facebook, accusing the company of “censoring” Russian media. It was not immediately obvious what Russia’s Facebook limitations would entail.

When asked if Russia had talked with Twitter about any steps, the firm did not immediately comment.