Mourners gathered in Moscow on Monday to mark two years since the death in custody of Russian opposition leader Alexei Navalny, under the sh...

The toxin is reportedly 100 times more powerful than morphine

The Foreign Office has blamed the Russian state for the death of opposition leader Alexei Navalny, which it said was the result of poisoning...

There is no innocent explanation for the toxin being found in samples taken from Navalny's body, Foreign Office says.

Five European countries say tests confirm Russian opposition leader Alexei Navalny was poisoned with a lethal toxin found in poison frogs, a...

Russian opposition leader Alexei Navalny was poisoned by the Kremlin with a rare and lethal toxin found in the skin of poison dart frogs, fi...

By JILL LAWLESS | Associated PressLONDON (AP) — Russian opposition leader Alexei Navalny was poisoned by the Kremlin with a rare and lethal...

Alexei Navalny was a fierce critic of Russian president Vladimir Puti

In a joint statement, the foreign ministries of the U.K., France, Germany, Sweden and the Netherlands say Navalny was poisoned by Russia wit...

European leaders said they are confident Navalny was poisoned with a toxin found in South American poison dart frogs.

Britain has blamed the Kremlin for killing opposition leader Alexei Navalny, which it said was likely done using a poison developed from a d...

The widow of Russian opposition leader Alexei Navalny has offered new evidence for what most already suspect: The Kremlin murdered her husba...

The widow of Alexei Navalny has said that two independent laboratories have found that her husband was poisoned shortly before his death in...

A planned classical music concert in Italy, featuring a Russian conductor known to be an old friend and vocal supporter of Russian President...

One year after the death of Russian dissident Alexei Navalny, his widow launches a satellite news channel broadcasting into Russia.