HI Aakanksha. I haven't been to those countries, I have been to Slovenia and Croatia and they were perfectly find and I hitchhiked. I would suggest going for it, but with appropriate planning about where to stay and taking proper precautions like not wandering around late at night.
As a resident of Ukraine and several times in Bulgaria, I assure you that there should not be problems with tourism in these countries in tourist and near tourist areas. And if you decide to travel to Ukraine - freely ask questions to me.
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