Poland's president has said gas flows from Russia to Western Europe should never be restored, even if Russia and Ukraine reach a peace deal.
Andrzej Duda told the BBC that Nord Stream pipelines not in use from 2022 “must be dismantled”.
This, he said, would mean the likes of Germany would not be tempted to restore Russian supplies to Boost your own struggling economy.
“I can only hope that European leaders will learn lessons from Russia's aggression against Ukraine and that they will push through a decision to never resume pumping gas through this pipeline,” he said.
The Polish president, speaking at the World Economic Forum in Davos, insisted that economic sanctions against Russia were working and European countries should resist pressure from companies to restore business ties.
The Nord Stream gas pipelines were built by Russia's gas giant Gazprom and run between Russia and northern Germany.
Nord Stream 1 was closed in 2022 and Nord Stream 2 was never used after the invasion of Ukraine. Both were damaged by explosions in 2022.
Gas prices in Europe have risen since the shutdown, and in recent months politicians from Germany's far-right AfD party have suggested that Nord Stream gas pipelines should resume operations.
Germany will hold federal elections at the end of February.
“I believe the Nord Stream pipelines should be dismantled,” Duda said. “This pipeline causes a very big threat to Ukraine, to Poland, to Slovakia, but also to other countries in Central Europe.”
He added: “It's a threat from an energy point of view, from a military point of view, but it's also a huge economic threat because it means Russian dominance over Europe in an economic sense.”
Regarding the prospect of a deal between Ukraine and Russia now that US President Donald Trump is in office, Duda insisted that peace talks cannot take place without Ukraine's participation.
“I say that in my capacity as the president of the Republic of Poland, as a neighbor of Ukraine, and also as the president of a country that has itself had very difficult historical experiences,” he said.
“I'm talking here and referring to the Second World War and to Yalta, where we were not included in these talks, where certain agreements were made beyond our heads, and then we found ourselves behind the Iron Curtain, where for almost 50 years, we were part of the Soviet sphere of influence,” he said.
Trump previously said he would negotiate a deal with Russia's full-scale invasion of Ukraine, launched in February 2022. in 24 hours – he has since admitted it could take a while.
Duda said it would be a “violation of international law” for Russia to be allowed to hold on to the territory it has occupied in Ukraine.
President Vladimir Putin has said he is ready to negotiate an end to the war, which first began in 2014 when Russia annexed Crimea, but Ukraine will have to accept the reality of Russian territorial gains, which are currently about 20 percent of its land.
Putin also refuses to accept Ukraine joining NATO, the Western military alliance.
Duda said: “The international community cannot agree and it is unacceptable for Russia to take certain territories of Ukraine and keep them by force. This is unacceptable.
“We must not let Russia win this war.”
Duda said Trump “understands the region” and U.S. involvement will be key.
“President Donald Trump as the leader of the most powerful country within NATO as the leader of the most powerful economy will be key.” Duda said.
“I am waiting calmly for the first steps that will be taken by Donald Trump.”