"We express sincere regrets over the escalation of tensions between Saudi Arabia and Iran because we believe these two large Muslim countries are very influential in the region, on the global arena and on the oil market," the source told RIA Novosti.
According to the diplomat, Moscow has friendly ties both with Tehran and Riyadh, and "is willing to play, if necessary, a role as a mediator in the settlement of existing and emerging discords between these countries."
The source also stressed that Moscow expects Saudi Arabia and Iran to continue their participation in Vienna format talks on Syria.
Saudi Arabia cut ties with Iran on Sunday, responding to attacks by protesters on its diplomatic missions in the two most populous Iranian cities of Tehran and Mashhad.
