Research the timeline. Originally they were unarmed protests and demanded the right to elect their governor and to decide on cultural issues. The weapons and demands for secession appeared after the government sent in the army and bombed the place.
Do you live in St. Petersburg? Here is an article from 2014 which refutes what you are saying. Don't fall for Russian propaganda.
"LUHANSK, Ukraine -- Dozens of pro-Russian armed men holding the Security Service of Ukraine headquarters don't put down their Kalashnikovs, even in the dining room. Since April 6, when the gunmen seized the government building, they and their hundreds of their supporters in a tent camp outside say they are ready for a police attack at any moment."
"A 48-hour ultimatum came and went from Arsen Avakov, the nation's top cop, who threatened the separatist militants with force if they don’t hand over their weapons and vacate the SBU building. But the insurgents, who call themselves Army of the Southeast, vow not to surrender until their demands are met."