Russian oil giant Lukoil has announced the death of its vice-president Vitaly Robertus.
Mr Robertus died "suddenly" at the age of 54, the firm announced in a statement, without giving any further details.
He had been at Lukoil for more than 30 years, and is the latest in a series of top oil and gas executives to have died in sudden circumstances.
Most recently, in October 2023, Lukoil said board chairman Vladimir Nekrasov died of heart failure at the age of 66.
Former top Lukoil executive Alexander Subbotin was found dead in May 2022 after apparently suffering a heart attack, while in September that year, state media reported that chairman Ravil Maganov died after falling from a hospital window in Moscow.
