Poland’s Prime Minister Mateusz Morawiecki has slammed German President Frank-Walter Steinmeier for his recent remarks suggesting that the controversial Nord Stream 2 gas pipeline that would deliver gas to Europe bypassing Ukraine and Poland should be supported as part of his country’s historical debt before Russia for World War Two.

“I agree with the [German] president that postwar debts have not been paid, but Nord Stream 2 is no compensation,” Polish Prime Minister Mateusz Morawiecki tweeted Thursday, February 11, as per Deutsche Welle.

“This move behind the EU’s back will facilitate Russia’s aggressive policies, increase Europe’s dependence, and undermine the economy and security,” PM added.

In an interview this week with the Rheinische Post, President Frank-Walter Steinmeier defended the near-finished pipeline, which will bring gas directly from Russia to Germany, bypassing Central and Eastern European countries including Ukraine and Poland.

But he also added that there is “another dimension for us Germans,” which relates to history. Steinmeier noted that this June will see the 80th anniversary of Nazi Germany’s invasion of the Soviet Union, and that 20 million Soviet citizens were killed as a result of the war.

The German president’s remarks drew widespread criticism in Ukraine and Poland, two countries that are strongly opposed to Nord Stream 2 and which also suffered huge losses during World War Two.