It seems these parties (Yabloko stated that they would exchange Crimea for an iPhone) are not especially concerned about losing even more of the little support they have. A good idea would have been to propose a new referendum in the Crimea which would at least get some attention and could highlight the illegality of the 2014 referendum. But it would be rather unpopular outside Russia, which I guess is more important for these parties.
Trolling gets them just as much attention. And, you know...it's
unarmed trolling.