Here are a few things you can do / read / watch:

http://epetitions.direct.gov.uk/petitions/57825 - please sign this.

http://www.augb.co.uk/news-page.php?id=1298 - a nice summary of what can be done from a UK perspective

http://www.economist.com/blogs/easternapproaches/2013/12/ukraine-0?zid=307&ah=5e80419d1bc9821ebe173f4f0f060a07

and a live street from maidan: http://www.youtube.com/watch?v=uWmzhTFc-5M