A Russian agency that regulates media said on Tuesday the micro-blogging site Twitter had refused 108 requests for account information and was "consistently not satisfying the requirements of the Russian law", the state-run news agency TASS reported.
Twitter said on Monday Russia had requested content be removed 91 times between July and December, the second-largest number after Turkey. It said it had complied with 13 percent of the Russian requests but denied several demands to silence Kremlin critics.
Moscow has tightened Internet controls since opposition activists made use of social media to organise mass protests against President Vladimir Putin in 2011 and 2012.
The Russian parliament has given initial approval to a law that would require Internet search sites to remove outdated or irrelevant personal information from search results on request from users.
The bill, passed by the State Duma lower house in its first reading, seeks to emulate European Union rules on the "right to be forgotten", under which search engines must take down certain results that appear under a search of a person's name.
Western technology companies, including Cisco, IBM and SAP, are acceding to demands by Moscow for access to review source code for security products such as firewalls, anti-virus applications and software containing encryption before permitting the products to be imported and sold in the country.