text:  A Russian court is ordering the arrest of the widow of late Russian opposition leader Alexei Navalny. As NPR's Charles Mains reports, she's facing charges of participating in an extremist group. The court order means Yulia Navalny, who currently lives outside of Russia, faces a possible six years in prison if she returns to her home country anytime soon. It also suggests Russian authorities are taking Navalny's growing role in Russia's exiled opposition seriously.