Five managers from a subsidiary of OAO Lukoil (LKOH.RS), Russia's second biggest oil producer, died in a helicopter crash in southern Russia on Wednesday, the company said in a press release.
The helicopter, which belonged to OAO Gazprom's (GAZP.RS) airline company GazpromAvia, was flying from Volgograd to Kotovo.
The five people killed were employed at Lukoil-Volgogradneftegaz, a Lukoil subsidiary in Volgograd.
U.S. oil major ConocoPhillips (COP) holds a 20% stake in Lukoil.