Not really. It was at most a few hundred firebomb throwing, Soros/EU funded neo-Nazis in one city.
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How weak does a leader have to be to have to run away from what you describe above.
About as weak as Yanukovich :-)
For a polar example look into how the Egyptian strongman, Abdel Fattah el-Sisi, dealt with a similar situation:
During the August 2013 Egyptian raids, the Egyptian military under El-Sisi's command joined with the national police in removing camps of Muslim Brotherhood supporters from sit-ins being held throughout the country. This action resulted in rapidly escalating violence that eventually led to the deaths of 638 people, of whom 595 were civilians and 43 police officers, with at least 3,994 injured.
The end result? El-Sisi is still there, and he is not leaving any time soon. This is what a real strongman does to his opponents. Yanukovich is not even close. And besides, why should an elected President be brave and ruthless? He is not a dictator who fears for his life. Democracy presumes voluntary acceptance of things. It was a good decision to walk away; now the population of Ukraine will figure out who came to power, why, and what should be done about that.