Russia and Iran are firming up bilateral relations in a 'trusting' atmosphere, Russia's foreign ministry said early on Tuesday after its chief, Sergei Lavrov, was received by Iranian President Ebrahim Raisi during a visit to Tehran. "In a traditionally trusting atmosphere, current aspects of the bilateral agenda were substantively discussed with an emphasis on further building up the entire complex of multifaceted Russian-Iranian partnership," the foreign ministry said in a statement on the Telegram messaging app.