What if, instead of intervening on Austria's behalf and crushing Hungary's independence rebellion, Russia--for whatever reason--would have decided that it is in its interests to intervene on Hungary's behalf in 1848-1849 (while also annexing Galicia from Austria as war spoils)?
Anyway, what would happen afterwards?
For the record, my own thoughts on this are these:
-With Galicia under Russian rule starting from 1849, Ukrainian nationalism fails to become a viable force. In turn, this causes Ukrainians--including in western Ukraine--to develop less of a national consciousness than they did in our TL--thus making them more appealing targets for Russification.
-Hungary (which consists of Trianon Hungary + Transylvania + Slovakia + Vojvodina) retains its independence and gradually becomes more and more of a Russian puppet state over the next several decades.
-Due to the exit of both Hungary and Galicia, Austria becomes much more German. In turn, this might very well trigger a large-scale uprising or rebellion in Austria in favor of unifying with Prussia/Germany in either the 1860s or 1870s. In turn, the creation of a unified Germany which includes Austria (consisting of Austria + Czechia + Slovenia + Croatia) in the 1870s would certainly create an even more powerful European hegemon during this time and beyond.
Anyway, what exactly--if anything--am I forgetting to list here?