LUKoil shed more than two-thirds of second-quarter net profit compared with last year and undershot forecasts, hit by lower oil prices, a weaker ruble and a bigger tax bill.
Net profit was just over $1 billion, against an average of analysts' forecasts of $2.34 billion.
LUKoil said second-quarter sales fell 7 percent to $32.4 billion from $34.91 billion in the year-earlier period, beyond analysts' expectations of $33.3 billion. EBITDA fell 35 percent to $3.46 billion from $5.35 billion a year ago.
Meanwhile, LUKoil Overseas, a LUKoil subsidiary, said it had discovered a new gas and condensate field at the South-West Gissar block in Uzbekistan.