http://news.yahoo.com/news?tmpl=story&u=/ap/20041210/ap_on_go_pr_wh/us_ukraine_election_3
This is an admission of funding of Ukrainian opposition from the US. This does not include the funding provided by Europe, various international organizations, Soros, and other private individuals.
To tell you the truth, I am surprised by the amounts involved. I thought American contribution was smaller than that.