A Russian court has jailed top Kremlin critic Alexei Navalny for two weeks in a move that prevents the charismatic leader from attending a massive opposition protest planned for March 1. The Moscow Presnensky court ruled that Navalny, who has a string of probes against him and was given a suspended prison sentence in December, organised an illegal gathering in the capital’s subway by handing out flyers advertising the March 1 protest.