Only the US : not the EU.
Russia's Ukraine tactics sharpen EU split on sanctions
Diplomats said three camps of roughly equal size emerged at Monday's EU meeting. Those pushing towards tougher sanctions were Britain, France, Poland, Sweden, Denmark, the Czech Republic, Estonia, Latvia and Lithuania.
Those most reluctant were Italy, Greece, Cyprus, Bulgaria, Luxembourg, Austria, Spain, Portugal and Malta. An undecided middle camp led by Germany included the Netherlands, Belgium, Finland, Ireland, Romania, Slovakia, Slovenia and Croatia.
Czech Defence Minister Martin Stropnicky spelled out the problems of trying to keep Europe united on sanctions, which require unanimous agreement under the EU treaty.
http://www.reuters.com/article/2014/04/15/us-ukraine-crisis-eu-idUSBREA3E15120140415
As stated - imposing economic sanctions would require the agreement of all 28 EU member states - one single veto would kill the issue.
In the case of Bulgaria if they voted for sanctions it would lead to the almost immediate downfall of their government.