Jailed Russian opposition politician Alexei Navalny had an extra 19 years in a maximum security penal colony added to his prison term Friday in a criminal case that he said afterward was designed to cow the Russian people into political submission.

Navalny, President Vladimir Putin's fiercest domestic critic, is already serving sentences totalling 11½ years on fraud and other charges that he says are also bogus. His political movement has been outlawed and declared "extremist."

A court at his IK-6 penal colony in Melekhovo, about 235 kilometers (145 miles) east of Moscow, on Friday brought to a close his trial on six separate charges, including inciting and financing extremist activity and creating an extremist organization.