UK's Magnitsky law does little to stem flow of dirty money from Russia

Sanctions target mid- or low-level officials and will have little impact on the wealthiest

He is known as Vladimir Putin's enforcer. Almost every criminal case in Russia - from Pussy Riot to anti-government street protests - passes his desk. But as of last week Moscow's top law officer, Alexander Bastrykin, is no longer welcome in Britain. He is banned from owning property, opening a bank account or popping over from Moscow for a weekend jaunt.

Bastrykin, the head of Russia's powerful investigative committee, was one of 25 Russians sanctioned by the UK. All were allegedly involved in human rights abuses - specifically in the mistreatment of Sergei Magnitsky, who was beaten to death in 2009 in a Moscow jail. Bastrykin covered up the case, No 10 says. Others named and shamed include judges, interior ministry officials and prison staff.