Polish gas monopoly Polskie Gornictwo Naftowe i Gazownictwo or PGNiG (PGN.WA) said Monday that the natural gas imported via Ukraine is flowing without interruption despite Russian gas monopoly OAO Gazprom (GAZP.RS) reducing gas supplies to Ukraine by 25%, according to Dow Jones.

PGNiG spokeswoman Joanna Zakrzewska told Dow Jones Newswires that the Polish company has enough gas stocks to cover 30 days of demand and if the supply from Ukraine were it could increase imports via Belarus.

"One of the contingency options is to increase pressure at the Belarussian connection. It`s technically feasible," Zakrzewska said.

Poland imports almost 70% of gas it consumes mostly from Russia via Ukraine and Belarus.

Gazprom said Friday that Ukraine`s supply would be reduced because the country has failed to act on a prior agreement between the Russian and Ukrainian presidents.