Iran's President Hassan Rouhani said his country's already "friendly relations" with Russia have expanded during his eight years in office, as he expressed "gratitude" to his "esteemed" Russian counterpart, Vladimir Putin.

Rouhani made the comments during a virtual inauguration ceremony for the launch of a 1,400-megawatt power plant in the southern province of Hormozgan. The plant is to be built in association with Russia.

Russian projects in Iran, however, have never ceased to draw controversy. Moscow repeatedly halted its work on the Bushehr nuclear power plant in Iran's south before its completion in 2013. The Russian government also delayed the delivery of its S-300 anti-missile systems for years despite several rounds of marathon talks, which pushed a frustrated Iran almost to the point of cancelation. Yet in his speech, Rouhani attempted to walk on eggshells, attributing delays in Russian projects to bureaucratic hurdles on both sides.

Apart from trade and economy, Rouhani said Iran and Russia have been closely engaged in regional cooperation, most notably over the Caspian Sea. In 2018, the Caspian Sea littoral states, which include Iran Russia, Azerbaijan, Kazakhstan and Turkmenistan, signed an accord on the legal status of the strategic sea's waters. As the Rouhani government has resisted calls for a full release of the details of the pact, speculation remains that Tehran might have ceded too much to Russia in return for too little.