Residents of 81 federal subjects of Russia will vote in regional and municipal elections starting Friday. The elections mark the second time this year that Russians are heading to the polls following the March presidential election. That vote, which saw Vladimir Putin win a fifth term virtually unchallenged, was marred by widespread reports of vote tampering, restrictions on monitors and pressure on voters. But unlike the presidential campaign, Russian media coverage of this year’s regional elections has been scarce — likely the result of a deliberate government strategy of decreasing voter tu…