"The limitation of natural gas supplies is a breach of the Yamal contract. PGNiG reserves the right to pursue claims in connection with the suspension of deliveries and will use all contractual rights vested in the company and rights under the law." Poland, which imports some 50 percent of its gas from Russia, has previously said it was ready to face any supply disruptions. Prime Minister Mateusz Morawiecki said on Tuesday that the country's gas storage facilities were 76 percent full, while Climate Minister Anna Moskwa has declared that "there will be no shortage of gas in Polish homes". 'Political tool' In Bulgaria on Wednesday, Prime Minister Kiril Petkov called the Russian demand to change its payment scheme a grave breach of a current contract. He said Bulgaria, which relies on Russia for nearly 90 percent of its gas needs, was currently reviewing all of its contracts with Gazprom, including for transit of Russian gas to Serbia and Hungary, because "one-sided blackmail was not acceptable".