Seems like that’s probably part of it. It could also be a response to the Russian offensives slowing down. Ukraine’s strategy so far seems to have been to stay on the defensive, preserve troops and bleed the Russian forces as much as possible as they advance. If Russia stops advancing, this strategy no longer works. Now that Ukraine has taken a seemingly significant area inside Russia itself, it means Russia is forced to keep playing an offensive role to bring this territory back under Russian control and Ukraine can continue with their strategy.
I’m no military analyst and I’m mostly just paraphrasing what Anders said but it seems reasonable. They seem to be playing their cards pretty close to the chest right now though as to what their actual objective is.