ORIGINAL: B52
2 . Provocation by Ukrainian nationalists. They practically are not controlled.
Nationalists can't situated in Crimea, because all entrance to peninsula is closed and peninsula flooded by "Crimea's self-defenders" also and from Russia, from krasnodar region mainly.
Provoke fire between Ukrainian and Russian solders makes no sense for the nationalists, but for russian it makes sense. Russian specnaz could do a provocation with snipers. For russians profitable provoke ukrainian soldiers to open fire first and making himself a victim of ukrainian aggression than will justify their intentions for UN & other countries.
This is not so . In Crimea 2 million population. Number of Russian troops 20,000 . Actually they control very little territory. Provocation by nationalists likely. I have seen how committed provocations in combat zones . Many nationalists against Ukraine's accession to the EU. To increase its value they need unstable situation . In Ukraine, all sorts of groups with different plans. May be a simple reason for firing - criminal .
Russia is not interested in shooting in the Crimea. If she wanted blood , she would have got it very easily. Soldiers from the Ukrainian side write that after shooting everything, and Russian and Ukrainians , very afraid. Russia and Ukraine immediately did everything possible to mitigate the effects of fire. Even Ukraine's defense minister would arrive in Crimea.
If the Russian special forces would accept the provocation, it would be a strong provocation. And there may have been shooting because of a quarrel between the soldiers.