Alexander V. Litvinenko

The fatal shooting in Moscow last week of a Russian opposition leader, Boris Y. Nemtsov, has prompted comparisons with the 2006 poisoning of Alexander V. Litvinenko, another foe of President Vladimir V. Putin.

Shortly after the radiation poisoning in London of a former K.G.B. officer, Alexander V. Litvinenko, a senior Russian official asserted that Moscow had been tailing his killers before he died but had been waved off by Britain's security services, according to a cable in the trove of secret American documents released by WikiLeaks. The Russian asser...

The fatal shooting in Moscow last week of a Russian opposition leader, Boris Y. Nemtsov, has prompted comparisons with the 2006 poisoning of Alexander V. Litvinenko, another foe of President Vladimir V. Putin.

Shortly after the radiation poisoning in London of a former K.G.B. officer, Alexander V. Litvinenko, a senior Russian official asserted that Moscow had been tailing his killers before he died but had been waved off by Britain's security services, according to a cable in the trove of secret American documents released by WikiLeaks. The Russian asser...