Russia has warned Britain it will respond tit-for-tat if London imposes any travel restrictions on Russian officials.
Russian Foreign Ministry spokesman Alexander Lukashevich said Moscow has asked London about a Sunday Times report claiming that British authorities had compiled a list of 60 Russian officials who could be denied entry over their alleged involvement in the prison death of Russian lawyer Sergei Magnitsky.
He added if the report is true, Russia will "respond in line with diplomatic practice".
Mr Magnitsky died in custody in 2009 after being arrested by the same government officials he had accused of corruption.
His case tarnished Russia's rights record and prompted the US House of Representatives to pass a bill in June targeting Russian officials involved in the case.