Ukraine’s outnumbered troops have been forced to retreat from three villages on the eastern front lines, the country’s top commander said Sunday, as Russian forces push to break through its beleaguered defenses while Kyiv waits for newly-committed U.S. military aid to arrive.

It was a rare admission from Ukraine’s new commander-in-chief, Oleksandr Syrskyi, that his troops were not only struggling but that the Russians were gaining the upper hand.

In a lengthy post on his Telegram channel Sunday, Syrskyi said the situation on the frontlines had “worsened.”