The history of armed conflict reveals at least one truism: wars are more easily started than concluded.
Consider the bloodiest conflict of the 20th century, the Great War.
The conflict was at a stalemate for years until the Australian General John Monash engineered a breakthrough at Villers-Bretenneux and Le Hamel. For years, the frontlines had barely moved a few hundred metres.
This truism is worth bearing in mind when considering the conflict in Ukraine.