SCRANTON, Sept 22 - Under tight security, President Volodymyr Zelenskyy on Sunday visited a Pennsylvania ammunition factory to thank the workers who are producing one of the most critically needed munitions for his country’s fight to fend off Russian ground forces.

Rep. Matt Cartwright, a Democrat who was among those who met with Zelenskyy at the Scranton Army Ammunition Plant, said the president had a simple message: “Thank you. And we need more,” according to The Associated Press.

The Scranton plant is one of the few facilities in the country to manufacture 155 mm artillery shells and has increased production over the past year. Ukraine has already received more than 3 million of them from the U.S.

Zelenskyy said he expressed his gratitude to all the employees at the plant.

“It is in places like this where you can truly feel that the democratic world can prevail,” he wrote on X. “Thanks to people like these — in Ukraine, in America, and in all partner countries — who work tirelessly to ensure that life is protected.”

Zelenskyy’s visit kicked off a busy week in the United States. He will speak at the U.N. General Assembly annual gathering in New York on Tuesday and Wednesday and then travel to Washington for talks on Thursday with President Joe Biden and Vice President Kamala Harris, as he seeks to shore up support for Ukraine.

The area around the ammunition plant had been sealed off since Sunday morning, with municipal garbage trucks positioned across several roadblocks and a very heavy presence of city, regional and state police, including troopers on horseback.

The 155 mm shells made in the Scranton plant are used in howitzer systems, which are towed large guns with long barrels that can fire at various angles. Howitzers can strike targets up to 15 miles to 20 miles (24 kilometers to 32 kilometers) away and are highly valued by ground forces to take out enemy targets from a protected distance.

With the war now well into its third year, Zelenskyy has been pushing the U.S. for permission to use longer range missile systems to fire deeper inside of Russia.

So far he has not persuaded the Pentagon or White House to loosen those restrictions. The Defense Department has emphasized that Ukraine can already hit Moscow with Ukrainian-produced drones, and there is hesitation on the strategic implications of a U.S.-made missile potentially striking the Russian capital.

At one point in the war, Ukraine was firing between 6,000 and 8,000 of the 155 mm shells per day. That rate started to deplete U.S. stockpiles and drew concern that the level on hand was not enough to sustain U.S. military needs if another major conventional war broke out, such as in a potential conflict over Taiwan.

In response the U.S. has invested in restarting production lines and is now manufacturing more than 40,000 155 mm rounds a month, with plans to hit 100,000 rounds a month.

Two of the Pentagon leaders who have pushed that increased production through — Doug Bush, assistant secretary of the Army for acquisition, logistics and technology and Bill LaPlante, the Pentagon’s top weapons buyer — were to join Zelenskyy at the plant. Pennsylvania Gov. Josh Shapiro, a Democrat, also joined the Ukrainian president.

The 155 mm rounds are just one of the scores of ammunition, missile, air defense and advanced weapons systems the U.S. has provided Ukraine — everything from small arms bullets to advanced F-16 fighter jets. The U.S. has been the largest donor to Ukraine, providing more than $56 billion of the more than $106 billion NATO and partner countries have collected to aid in its defense. (ap/ez)