Ukraine's acting president has warned Russia that troop movements outside its naval base in Crimea would be seen as an "act of aggression". Armed men seized regional government headquarters and parliament and the Russian flag is flying from buildings
People have been bringing flowers and candles to a number of sites around downtown Kiev in Ukraine, and a number of makeshift memorials have started to spring up in places where some of the most deadly violence took place.
Hundreds of people have been filling areas all across the city, including Independence Square, to gather together and reflect on those who died.
The names and faces of those killed have been displayed, with messages from their family and information on their life.
People have gathered to pray, comfort each other, and pay tribute to their dead.
As the tributes continue to grow, acting interior minster Arsen Avakov said the riot police, responsible for the deaths of the 100 people killed in the clashes, has been disbanded.
Snipers from the "Berkut Force", whose name means golden eagle, are blamed for the deaths of most of the protesters.
Writing on Facebook, Avakov said:
"I have signed an order for the liquidation of the Berkut special police units."
Ukraine's interim President has expressed concerns about signs of separatism as opposition in Russian-speaking regions grows.
Hundreds of Ukrainians and journalists flocked to the presidential palace, as reports emerged that President Yanukovich had left the city.
Vitali Klitschko was met with boos from anti-government protesters, as he attempted to convince them a peace deal is best course of action.