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“I am flying to the United States to strengthen the alliance with our most powerful ally, with a country that guarantees security in Europe, that especially guarantees security in our part of Europe,� Morawiecki said.

Following Russia's full-scale invasion of Ukraine last year, — a nation on NATO's eastern flank that borders Ukraine and Russia's Kaliningrad exclave — and has used Poland as a transit country for military and humanitarian aid going into Ukraine.

Poland is also a major donor of aid to Ukraine, and has been ordering fighter jets, tanks and other modern military equipment, mostly from U.S. and South Korean producers, to strengthen its own forces and replace some older equipment sent to Ukraine.

As , Poland is also planning to build nuclear power plants, and has chosen the U.S. government and Westinghouse as its partners for its first plant, to be opened in 2033.

Before departing Warsaw early Tuesday, Morawiecki told reporters at the airport that Polish-American relations “have not been so good for a long time, and perhaps they have never been so strong.�

He said his talks with the U.S. defense industry will also include talks on financing the billions of dollars of current and planned purchases. Poland is buying U.S. F-35 fighter jets, Abrams tanks, HIMARS artillery systems and Patriot missile launching units.

Morawiecki's visit follows two visits to Poland by U.S. President Joe Biden since Russia invaded Ukraine in February 2022. Ukrainian President Volodymyr Zelenskyy also last week.

The prime minister said Poland’s alliance with the U.S. is “an absolute foundation of our security.�

“It is based on two pillars: economic and defense cooperation. I am going to the U.S. to strengthen both of these pillars,� he said.

Morawiecki said that U.S. companies have invested some $25 billion (euros 23 billion) in Poland, creating thousands of jobs.