Polish Prime Minister Mateusz Morawiecki has accused Russia of "direct attack" on his country, with the decision to cut off gas supplies.
He has reassured his people that supplies will come through other pipelines in the autumn and that Poland will no longer need Russian gas.
"This is a direct attack on Poland… but we were preparing to that point," said the Polish prime minister.
He announced that Poland Świnoujście terminal is operational and will expand its production from six billion cubic meters of LNG (liquefied natural gas) between seven and eight billion cubic meters.
Morawiecki also noted that a new gas pipeline under construction in Norway called the Baltic Pipeline will be completed within three months, which he said will pump 10 billion cubic meters of LNG to Poland.
A new cross-border pipeline under construction with Slovakia will pump more than five billion cubic meters of LNG once completed, he said.
Poland also has interconnections with Germany and the Czech Republic, and "in a few days, we are opening an interconnection with Lithuania," he said. He said this was all over 20 and 21 billion cubic meters of domestic LNG production.
"We will not bow to this blackmail. I want to assure my fellow citizens that the actions of [Russian President Vladimir] Putin will not affect the situation in Poland. "Russia not only carried out a brutal, deadly attack on Ukraine, but also attacked energy and food security."
He further added:
"Ukraine is on the front line. "We, all European countries, must be aware that this is a war for peace, a war for sovereignty, a war for security, and we must not bow down."