I think this is exactly what Putin is hoping for. He has spent the past several weeks doing everything possible to foment disturbances in Eastern Ukraine. Not so easy when the general sentiment does not favor a Russian annexation.
What would we do if ethnic language speakers suddenly took over government buildings and demanded a referendum to join a foreign country? (San Diego? Los Angeles, Miami, El Paso?)
"There are reports on social media this morning about how pro-Russian residents of Kharkiv stormed the Opera, thinking that it was the town hall, and demanded that the mayor come out. It's very surprising that these so-called residents of Kharkiv would think that the Opera was the town hall."
http://osce.usmission.gov/apr_7_14_ukr2.html
Ukraine would do well to capture some of these "residents" and prove their identity, if possible.