You obviously have only been paying attention to the western media perspective.
You have to understand both perspective and read between the lines as well as have some historical understanding.
The entire situation in Ukraine is a result of an underhanded U.S. geostrategic goal to contain Russia. In the same way that the Arab Spring was nurtured by U.S. agents so were the events of Euromaiden.
Look up and read about Zbigniew Brzezinski who has commented extensively on how Russia is to be contained via strategic goals implemented in Ukraine. Brzezinski is one of the establishment movers and shakers in this world. Henry Kissinger has even admitted that most people don't understand the greater context of what is actually going on.
The U.S. sponsored the TechCamp Project which is what nurtured Euromaiden into reality, the U.S. then basically guided the new government into power. This has all been proven but is simply glanced over in the media.
Here is evidence of the TechCamp Project in Ukraine...
TechCamp:Kiev Agenda - TechCampGlobal
Here is evidence from the Ukrainian Rada where a warning was given about TechCamp being used to destabilise Ukraine and bring about a civil war in order to further U.S. interests. Note the date is Nov, 11, 2013 which is BEFORE Euromaiden took place.
Party of Regions MP Tsariov accuses US Embassy in Ukraine of training revolutionaries for street protests
Party of Regions MP Tsariov accuses US Embassy in Ukraine of training revolutionaries for street protests
Here is the transcript from the leaked phone call between Victoria Nuland (U.S. Assistant Secretary of State) and the U.S. Ambassador to Ukraine where they discuss how they are manipulating the formation of the new government.
BBC News - Ukraine crisis: Transcript of leaked Nuland-Pyatt call
The Right Sector Bandera nationalists took advantage of the Euromaiden and were able to radicalise a great amount of people and influenced the government in such a way as to be able to form their own armed paramilitary units such as the Azov and Aidar Battalions. Anti-Russian sentiment and persecution of anyone with a pro-Russian sentiment resulted from this and that is what led to the Odessa Massacre in which over 40 people were burned to death by Right Sector activists.
This clear Anti-Russian sentiment even exhibited actions like the bashing of the pro-Russian candidate who was running in the national election after Euromaiden. He had to flee Kiev for his life.
The people of Donbass reacted to these events and protested in the streets eventually leading to the takeover of administration buildings in their region by both unarmed and armed activists.
A Russian by the name of Igor Strelkov who is a very idealistic man saw what was going on in Ukraine and also saw western actions as a threat to the future of Russia and thus organised a group of about 30 men and crossed the border into Ukraine. They journeyed to Slaviansk where they were welcomed by the locals (Slaviansk was a mid sized pro-Russian town specifically chosen for this) where they proceeded to take over the police station and barricade the town. Many locals joined the separatist movement.
Anti-Russian violence in the country also resulted in violence in some places in Donbass against those who were outspokenly anti-Russian. Sin produces sin.
Kiev reacted to the separatist uprising and calls for a referendum by sending the military to suppress it.
The people of Donbass held a referendum on independence from Ukraine which had a very high turn out. Many people joined the militias, especially after the Odessa Massacre, and prepared for a confrontation with the Kiev authorities.
Then the Anti-Terrorist Operation began in which many civilians have died. The indiscriminate targeting of residential areas resulted with an increase of support for the separatist cause among the locals and a full scale civil war began.
The west portrays the whole thing as a Russian invasion when nothing could be further from the truth. Sure Russia is supporting the L/DPR with humanitarian aide, allowing volunteers, and probably ammunition (although that is hard to prove).
Ukraine is a proxy war being fought between Russia and the U.S. oligarchs and the people there are caught in the middle.
We ought not support the U.S. oligarchs or the Nazi supportive government in Kiev. We ought not support Russia either, for our war is not against flesh and blood. Yet Russia is most definitely espousing a more accurate version of what is going on whilst the western media is espousing a total fictional account.