Would it have been plausible for Russia to declare war on Austria either during the Second Italian War of Independence (in 1859) or during the Austro-Prussian War (in 1866) with the purpose of acquiring Galicia?
Basically, a Russian grab of Galicia would eliminate a source of territorial dispute between Russia and Austria (thus making a future Russo-Austrian alliance at least a little more likely) and would also punish Austria for its neutrality during the Crimean War.
Also, if this would have been plausible, what exactly would the consequences of this have been? For instance, how would Ukrainian nationalism have developed in this TL?