WARSAW, May 7 - Firm support is required from Ukraine in order to extend the existing pipeline from the Black Sea port of Odesa to the Polish city of Plock, Poland's Economy Minister Piotr Wozniak said Monday.

"In truth we need to have oil suppliers in order to have this pipeline built," Wozniak said in an interview for the Polish daily Rzeczpospolita, Interfax reported. "There is, however, the second condition - firm support of this investment by the Ukrainian authorities."