Russian investigators have launched a new "extremism" probe against jailed Kremlin critic Alexei Navalny and his top allies that could see the opposition leader spend up to 10 more years in jail. The fresh probe comes after Navalny's groups were already banned as "extremist" earlier this year and President Vladimir Putin's party this month shored up another five years in control of the lower house of parliament. SHORT PROFILE of Alexei Navalny