Iranian Foreign Ministry has strongly condemned the Bahraini government for upholding a nine-year prison sentence for Sheikh Ali Salman, a prominent Shiite cleric and opposition leader.

"The unjust and tough encounter with the peaceful and moderate Bahraini leaders will not resolve the numerous problems of that country (Bahrain), but will also result in disappointment of the enthusiasts, believers and followers of the peaceful means," Iranian Foreign Ministry spokesman Bahram Qassemi said on Monday.

Qassemi said that only through depending on the people's power it would be guaranteed that governments will be able to continue their activities.

Prominent Shiite cleric Sheikh Salman was at first sentenced to four years in prison but Bahrain’s Supreme Court of Appeal expanded his sentence to nine years on May 30.

Salman was arrested back in 2014 on charges of trying to overthrow the Bahraini government and working with foreign powers.

However, h has denied the charges, noting he has been promoting reforms in the small Persian Gulf country through peaceful measures.

The Office of the UN High Commissioner for Human Rights (OHCHR) has repeatedly asked Bahraini government to free the prominent cleric.

Since his arrest, thousands of protestors have held rallies on numerous occasions in Bahrain on an almost daily basis ever since a popular uprising began in the kingdom in 2011.