This is not a winning strategy. From Moon of Alabama at moonofalabama.org:
The Russian military forces are grinding down Ukrainian ground forces by extensive use of heavy artillery. The Ukrainian artillery has been destroyed or lacks ammunition.The Ukrainian forces have orders to stay in their position and to hold the line. That only makes sure that Russian artillery strikes will destroy them.
The order was given because the ‘west’ has pushed the Ukrainian president to not make peace with Russia. The consequence will be the assured destruction of the Ukrainian military.