SCRANTON, Pa. >> Under tight security, Ukrainian 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.”

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.”

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 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.