The missiles reportedly struck residential buildings in the capital, Kyiv, and additional sites across the country.
"It is not lost on us that, as world leaders meet at the G-20 in Bali to discuss the issues of significant importance to the lives and livelihoods of people around the world, Russia again threatens those lives and destroys Ukraine’s critical infrastructure," said Sullivan in a statement.
"These Russian strikes will serve to only deepen the concerns among the G-20 about the destabilizing impact of Putin’s war," he added.
Sullivan said the US and its allies will continue to assist Ukraine to defend itself against Russia.
According to Ukrainian President Volodymyr Zelenskyy, Russia has carried out 85 missile strikes across Ukraine, mostly aimed at energy infrastructure.
Ukrainian officials reported explosions in cities, including Rivne, Lviv, Vinnytsia, and Kovel.
Parts of Rivne, the administrative center of the western Rivne region, have been left without electricity after blasts at a critical infrastructure location, Mayor Alexander Tretyak said on Telegram.
Source: Anadolu Agency