War is, and has always been about logistics and material. Russia has China propping them up now. The west cannot send money to fight bombs. Ukrainian forces need air support and artillery shells, full stop.
Until the Ukrainian Forces get a substantial arms package, Russia will keep throwing unskilled bodies at Ukrainian trenches.
This is how Russian doctrine has always worked. Throw bodies at the problem until there are no more bodies. Encourage women to have more children. Rinse and repeat.