By Andrew Osborn and Polina Devitt MOSCOW (Reuters) -Russia sharply escalated a campaign against jailed Kremlin critic Alexei Navalny on Tuesday, opening a new criminal case against President Putin’s fiercest domestic critic that could allow the authorities to hand him another decade in jail. In a case condemned by the West, Navalny, 45, is already serving two-and-a-half years in prison for parole violations he says were trumped up to thwart his political ambitions. His allies have had their homes raided, their freedom of movement restricted, or fled abroad after a court in June ruled their ac…

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