A regional Greek court has ruled that Iranian oil seized from a Russian-flagged tanker in April must be returned, a Greek government official said Thursday. The official added that Athens was “very hopeful” the move would lead to the release of two Greek-flagged tankers seized by Iran in retaliation last month. The appeals court in Halkida took the decision in a ruling on Wednesday that has not yet been made official, the source told AFP on condition of anonymity. “The court has ruled that the cargo be released. The Greek government was not involved,” the government official said. The Russian-…