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
Ukraine's athletes were denied permission to wear black arm bands in memory of the 26 people that have been killed in violent clashes by the International Olympic Committee today.
The country's athletes admitted the ongoing unrest was proving to be a distraction.
"Yes it's a distraction, everyone's talking about it - even just now at the start, at the finish, people are saying 'what's happened in your country, what's happened?'" Dmytro Mytsak, a Ukrainian giant slalom skier, said.
The 18-year-old revealed that the team were grateful to receive support from the Russian spectators.
Former pole vault champion and Ukraine's Olympic chief Sergey Bubka, in Sochi for the Games, called for calm and urged all parties to stop the violence.
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.