The Central Asian state, formerly part of the Soviet Union, borders Afghanistan and is seen in Russia and the West as a conduit for drug traffickers and militants. Russia, which supported President Imomali Rakhmon in a civil war in the 1990s, maintains a military base there.
Tajikistan arrests 23 leaders of banned opposition party
The sentences passed by Tajikistan's Supreme Court completed the virtual elimination of the main opposition force capable of challenging Rakhmon, in power since 1992, and follow a May referendum that could allow him to rule for life.
The court has also sentenced 11 other members of the Islamic Renaissance Party of Tajikistan to 14-28 years in prison and Zarafo Rakhmoni, the only woman among the defendants, to two years on the same charges.
The U.S.-based Human Rights Watch has described the trial as part of a "severe crackdown on political opposition".
Tajikistan okays constitutional changes ending president's term limit
Tajikistan banned IRPT last September after accusing it of being linked to a failed coup earlier that month led by a general, Abdukhalim Nazarzoda, who was killed along with 37 of his supporters in clashes with government forces.
IRPT chairman Mukhiddin Kabiri, who has left Tajikistan and spoke to Reuters before the verdict was announced, dismissed the charges as trumped-up and said they were part of a broad campaign aimed at eliminating the party.
"What is happening in the country will play into the hands of radicals and more and more youths, having lost all trust in the government, will join the ranks of exrtemist groups," he said.
"Perhaps, this is what the Tajik government wants in order to draw the international community to its side against the background of growing extremist tendencies."
13 handed long jail terms in Tajikistan for raising 'IS flag'
IRPT was a successor to the Islamist wing of an opposition bloc which fought Rakhmon's government in a bloody civil war in the 1990s. The crackdown on the party marked a decisive break from the power-sharing agreement which ended the war.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ