The UK and its allies say Russian opposition leader Alexei Navalny died in prison in Siberia after being poisoned with a deadly toxin found on the skin of Ecuadorian dart frogs. The poison used - called epibatidine - is described as "one of the deadliest on earth". Sky's Deborah Haynes reports. | Sky News

The Kremlin is denying a joint report from several European countries which found that Russian opposition leader Alexei Navalny was poisoned with a rare lethal toxin found in poison dart frogs from South America “It’s important to point out Russia has a history of poisoning political opposition figures,” ABC News contributor Mick Mulroy said. Read more: https://abcnews.visitlink.me/ICqPXP | ABC News

WATCH: Protests in Moscow escalated over the weekend, including bouts of violence with police. 👉 Supporters of jailed opposition leader Alexei Navalny are staging protests across Russia Sunday over plans to increase the nation's pension age, as Russians go to the polls for regional elections. https://www.voanews.com/a/demonstrators-protest-russian-pension-reform-plans/4563696.html?nocache=1 | Voice of America

Alexei Navalny was a staunch opponent of Russian President Vladimir Putin, orchestrating some of the biggest anti-Kremlin protests in the country before his death in a Siberian prison at the age of 47, the circumstances of which remain disputed. | CNN