"It is important that America hears Ukraine," Zelenskyy wrote, confirming that two letters had been delivered.
"It is quite unusual for a leader of another nation to write to both the US president and the country's Congress. But the situation requires action, quick and effective action," Zelenskyy continued in a post on X on Wednesday.
Zelenskyy's appeal concerns ammunition for the Patriot air defense system.
The request also applies to support for other American weapons systems that Ukraine uses in defense against Russia's full-scale invasion.
The letters were delivered on Tuesday, according to President Zelenskyy.
