Cecilia Lei

Over the weekend, European governments said they believed Navalny had been poisoned by a toxin that's produced in South American poison dart frogs.

Here's the UK's Foreign Secretary, Yvette Cooper.

Russia has denied poisoning Navalny.

They've always maintained that he died of natural causes while being held in an Arctic penal colony.

Marco Rubio said he found the report troubling while speaking to reporters over the weekend.

The toxin, called epibetadine, has been tested as a painkiller, but was deemed too dangerous for use clinically.

One chemicals expert told the BBC that it's only found in tiny quantities when the frogs eat specific diets.

She said the challenge of finding the toxin meant it was an incredibly rare way to poison a person.

Krzysztof Grażew is an investigative journalist who is close to Navalny.

He uncovered the Russian security service's plot to poison Navalny back in 2020.

He told the BBC that even if the news comes as no surprise, it remains important.

Navalny's wife, Yulia, was at the Munich Security Conference over the weekend as she continues to campaign for democracy.

She gave her reaction of the news to Politico.

That justice might be hard to achieve.

Since Navalny's death, Russia's opposition has struggled to unite behind a clear plan.

A small victory for opposition leaders came in late January, though.

A new body was created to help them engage with European lawmakers.

And here's a few other stories we're following.

A shooting at a Rhode Island high school hockey game yesterday left two people dead and three more critically injured.

The suspected shooter also died of a self-inflicted wound.