NATO doesn't intend to ever fight a trench war. The war in Ukraine is a useful testing ground for certain weapons but I don't think they care much about trench warfare in general. NATO doctrine has always been to destroy the adversary's air defense system first, then rely on air dominance to enable maneuver warfare on the ground. Neither Russia nor Ukraine had much in the way of functional air forces so they had to fall back on more primitive attritional tactics.