US Secretary of State Antony Blinken hinted at the shift during a visit to Moldova on Wednesday.
“At every step along the way, we’ve adapted and adjusted as necessary,” he said.
“And so that’s exactly what we’ll do going forward.”
Russian forces appear to have recently taken advantage of a window of opportunity to push deeper into Ukrainian territory in Kharkiv as Kyiv waits for further Western weapons to arrive at the front.
At least 12 people were killed and dozens more were wounded last week after Russian forces hit a supermarket in the city of Kharkiv with two glide bombs.
Early on Friday, Kharkiv regional governor Oleh Syniehubov said on Telegram that Russian shelling had struck a five-storey apartment block in the Novobavarskyi District of Kharkiv, destroying part of the building and causing a fire.
At least three people were killed and 16 were injured, including a 12-year-old boy and a 12-year-old girl, both of whom were taken to hospital, he said.
The Ukrainian official accused Russian forces of targeting “exclusively civilian infrastructure” and using a “double-strike tactic”, hitting the site for a second time after paramedics and rescue workers had arrived.