The mud must be to the point of drying out enough that offensives and counter-offensives can be mounted. The pre-emptive airstrikes, like you are saying, are being used to stop, prevent, or significantly blunt it before it even begins.
Missiles Strike Pavlograd; US Military: Russia More Powerful Now, Biden Looks for Way Out
https://www.youtube.com/watch?v=VzxRjnnKDb4&ab_channel=AlexanderMercouris