WARSAW, May 21 (Reuters) - Poland’s Energy Ministry said on Tuesday that Energy Minister Krzysztof Tchorzewski requested urgent action from Russia to return to supplies of clean oil as quickly as possible. The work of Polish refineries is continuing uninterrupted according to information from oil sector, the ministry said in a statement.

Flows through the Druzhba pipeline from Russia were suspended last month due to contaminated crude in the system, sending shockwaves through global oil markets. (Reporting by Alan Charlish, Editing by Joanna Plucinska)