A friend of Russian opposition figure Alexei Navalny maintains his death was an assassination. 

American financier Bill Browder was the biggest foreign investor in Russia, and was deported in 2005 for opposing Kremlin-backed companies 

He told Mike Hosking this isn't the first attempt to kill Navalny, and says Putin tried to poison him with a banned Soviet-era chemical in 2020.   

Browder says there's no doubt he was assassinated and those who believe the official version he died of natural causes aren't looking at the facts. 

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