The 2014 one was basically an association agreement with EU fell through, in part because they / the IMF were unwilling to extend a line of credit without massive cuts to government subsidized gas / energy and Russia threatened to cancel the Tarif agreements between Ukraine / Russia (as they otherwise would have given unrestricted access to EU goods to Russia. Russia instead gave a ~15 billion credit. Various NGOs then followed a typical playbook, occupy a central square, agent provocateurs showed up and created violent incidents, the Kiev mayor ordered a violent removal of protestors in order to install christmas decorations. Some protestor was shot, turned into a martyr, the investigation who was responsible has been inconclusive afaik. Various neo nazi groups (right sector) started arming themselves and attacking security forces, trying to storm government buildings. In total I think roughly ~120 protestors and ~20-40 security forces were killed. Janukovitch narrowly escaped the storming of his residence. Orange Revolution I don’t really remember any details.
I answered above in relationship to foreign interference and how sophisticated it can be. Ukraine has been of interest since the end of WWII to American intelligence, with many former Ukrainian Nazi Collaborators and Resistance fighters being approached by British and US intelligence.
