The U.S. Embassy in Ukraine said this on Twitter, Ukrinform reports.
"I have just arrived in Kyiv, Ukraine. It is a critical moment for the Ukrainian people as they defend their freedom from brutal attack, liberate occupied land, prepare for winter, and strengthen democratic institutions & the rule of law. USAID now & always stands with Ukraine," the embassy quoted Power as saying.
According to USAID, its head will hold meetings with Government of Ukraine partners, journalists, farmers, young entrepreneurs, and energy workers.
"Focus on how USAID assistance to Ukrainian people can be even more effective amid Russia's brutal war," the agency tweeted.
USAID is an independent agency of the U.S. government responsible for non-military assistance to other countries.
Power has headed USAID since April 2021.