Washington's top diplomat met with President Zelenskyy and Foreign Minister Dmytro Kuleba, and was also scheduled to meet Prime Minister Denys Shmyhal for talks on the current counteroffensive and efforts to rebuild the country.
During the meeting with Zelenskyy, Blinken vowed that Washington would continue to walk "side by side" with Ukraine.
The secretary of state hailed what he described as "very encouraging" progress in Ukraine's counteroffensive against Russia, which Kyiv launched earlier this summer.
"We see the important progress that's being made now in the counteroffensive and that's very, very encouraging," Blinken said.
The United States has invested more than $43.8 billion in security assistance for Ukraine, including more than $43.1 billion since Russia’s full-scale invasion, according to State Department figures.