Honestly if Russia didn’t do a full scale invasion and just annexed the lands they were originally aiming for I think the west would have probably ignored it like all their other activities in the region.
I suspect the irritation over the previous annexation of Crimea and Ukraine’s increasingly pro-Western orientation would have led to a Western response even if the invasion wasn’t full scale, but it’s certainly not impossible that the West would’ve prioritized keeping things ‘calm’ over protecting Ukraine’s sovereignty in such a scenario.
Honestly if Russia didn’t do a full scale invasion and just annexed the lands they were originally aiming for I think the west would have probably ignored it like all their other activities in the region.
I suspect the irritation over the previous annexation of Crimea and Ukraine’s increasingly pro-Western orientation would have led to a Western response even if the invasion wasn’t full scale, but it’s certainly not impossible that the West would’ve prioritized keeping things ‘calm’ over protecting Ukraine’s sovereignty in such a scenario.