Iran's oil minister, Bijan Zanganeh, is part of the delegation led by Iranian President Hassan Rouhani visiting Russia on March 27-28, two Russian government sources told Reuters on Monday.
Earlier on Monday, Rouhani told reporters that Tehran welcomed Russian investment in its gas and oil fields, signaling major developments in energy cooperation between the two countries.
(Reporting by Denis Pinchuk; writing by Katya Golubkova)