MOSCOW (AP) — A Russian court on Tuesday convicted top opposition leader Alexei Navalny of fraud and contempt of court, sentencing him to nine more years in prison in a move that was seen as an attempt to keep President Vladimir Putin's biggest foe behind bars for as long as possible.

The new sentence follows a year-long crackdown by Putin on Navalny's supporters, other opposition activists and independent journalists in which authorities appear eager to stifle all dissent.

Navalny's close associates have faced criminal charges and left the country, and his group's political infrastructure — a...