LONDON—Iran’s oil minister is scheduled to meet his Russian counterpart in Iran later on June 17, industry sources said, raising hopes of progress in resolving a month-long impasse over when OPEC and its allies will hold their next policy gathering.

OPEC and partners including Russia, an alliance known as OPEC+, have been considering since last month moving the date of their policy meeting in Vienna to July 3-4 from June 25-26.

Russia’s Alexander Novak favors postponing the meeting to early July to avoid clashing with G20 discussions in Japan in late June, while the Iranian minister, Bijan Zanganeh, wants to keep the original schedule, sources have said.

The two are scheduled to meet at 5 p.m. Tehran time (8:30 EDST), one of the sources said.