The owners of three vessels chartered by India's Nayara Energy have asked to end their contracts with company, six sources familiar with the matter said on Tuesday, under pressure from EU sanctions imposed on the Russian-owned refiner.

Microsoft Corp. has stopped providing services to Rosneft-backed Nayara Energy, the Indian oil refiner said in a statement, adding to challenges facing the company, which was recently hit with European Union sanctions.

Nayara Energy has approached the Delhi High Court, challenging Microsoft's decision to block its system access and data, citing EU sanctions on the Rosneft-backed refinery. Nayara argues that Microsoft's action,