20 February 2014 Last updated at 04:54 ET Profile: Ukraine's key protest figures
Ukraine has been gripped by mass protests since President Viktor Yanukovych rejected a far-reaching deal with the EU in favour of stronger ties with Russia in November 2013.
The unrest has united pro-EU and ultra-nationalist leaders in the fight against the government.
Here we profile some of the most prominent protest leaders.
Vitali Klitschko Oleh Tyahnybok Yulia Tymoshenko Arseniy Yatsenyuk Yuriy Lutsenko
In the early days of the protests in Kiev, the most radical activists on Independence Square created the Right Sector movement, which have taken an active part in violent clashes with police.
The group consists mostly of young men with right-wing views. They come from different regions of Ukraine, and there are both Ukrainian and Russian-speaking people among them.
The members often wear masks, helmets and protection for their hands and feet, and carry sticks or iron bars in case of confrontation with riot police.
Unlike other protesters, most of the Right Sector activists do not support the idea of joining the EU, which they consider to be an "oppressor of European nations".
The organisation believes the current situation is an opportunity "to destroy the state skeleton" and start building a new state.
The Right Sector does not associate itself with the nationalist Svoboda, which it considers to be too liberal and conformist.