Russia's Syzran oil refinery has been forced to halt operations following a drone attack on May 21, according to sources familiar with the matter. The facility, located in the Samara region, suspended production after the unmanned aircraft strike.

Separately, Russian authorities reported the discovery of magnetic mines on a tanker at the Ust-Luga port, a major Baltic Sea terminal used for oil exports. Officials did not immediately provide details about when the mines were found or the identity of the vessel involved.

The incidents come amid ongoing tensions in the region, with energy infrastructure increasingly becoming a target. The Syzran refinery is one of several Russian oil facilities that have faced disruptions in recent months.

Meanwhile, explosions were reported in Iran's Bandar Abbas region, though Iranian state news agency Mehr said the situation in the strategic port city was under control. No immediate connection was established between the Iranian incident and the events in Russia.

Russian officials have not yet provided details about the extent of damage to the Syzran refinery or timeline for resuming operations. The facility's shutdown adds to concerns about potential impacts on regional fuel supplies and energy markets.