ARTICLE AD BOX
Russia will stop sending gas to Poland from Wednesday, the Polish state gas company PGNiG has said.
PGNiG said Russian energy firm Gazprom had told it all gas deliveries to the country would be halted from 08:00 CET (07:00 BST).
Gazprom has justified the suspension under new rules announced last month, which mean "unfriendly" countries must pay for gas in roubles.
PGNiG has refused to do this.
PGNiG relies on Gazprom for the majority of its gas imports and bought 53% of its imports from the Russian company in the first quarter of this year.
It described the suspension as a breach of contract, adding that the company would take steps to reinstate the flow of gas.
The move does not create an immediate threat to gas supplies in Poland.
PGNiG said its underground gas storage is almost 80% full and with summer approaching demand is lower.
Poland also has alternative supply sources, including a liquefied natural gas terminal (LNG) in Swinoujscie.
And on 1 May, a new gas pipeline connection with Lithuania is due to open that will give Poland access to gas from Lithuania's LNG terminal.
It can also buy gas on the European spot market and get it delivered through pipelines to Germany and the Czech Republic.
However, if Russian gas supplies remain suspended for several weeks, the country will probably have to start restricting supply to the country's largest consumers, such as chemical manufacturers, the BBC's Warsaw correspondent Adam Easton said.
Poland was already planning to stop importing Russian gas by the end of the year, when its long-term supply contract with Gazprom expires.
And a new pipeline delivering gas from Norway, known as the "Baltic Pipe", comes online in October. It should reach full capacity by the end of the year and could replace all Russian deliveries.