The last straw was the rejection of President of Ukraine Viktor Yanukovych to sign an association agreement with the EU.
We ask to support Ukraine in the overthrow of the current government peacefully, holding democratic elections for a new parliament and bring to justice all present perpetrators of state power.
http://www.youtube.com/watch?v=JoTvgD_mgJU
http://www.youtube.com/watch?v=NiT0zcDA9RU