Controversial US media personality Tucker Carlson has spoken to Russian president Vladimir Putin for an interview that's set to air tonight. The 54-year-old is the first Western journalist to interview Mr Putin since Russia invaded Ukraine nearly two years ago. But who is Tucker Carlson, why did Mr Putin agree to the interview and what was Carlson's rationale for giving the Russian leader a platform? Tucker Carlson's Fox News show Carlson, who has been a vocal supporter of Mr Putin in the past, was sacked from Fox News in April last year. He took up the prime-time weekday evenings spot...