Russia appears to have launched a “renewed offensive” against Ukrainian troops in the eastern part of the country as the war inches closer to entering its second winter, National Security Council spokesperson John Kirby said on Friday.

But Russian troops haven’t made much progress, Kirby said, adding that the new attacks are “not a surprise.”

“The Russian military appears to be using human wave tactics where they throw masses of poorly trained soldiers right into the battlefield without proper equipment, and apparently without proper training and preparation,” he said.