I bought a stolen car on consignment, will I be responsible?

No, it will not, if you prove that you were not aware of the fact that you purchased a car that was obtained by criminal means.

According to Article 198 of the Criminal Code of Ukraine, when the buyer realizes that he is buying an illegally legalized car using forged documents, he faces criminal liability for the previously unpromised acquisition of property obtained through criminal means, which is punishable by arrest for up to six months or restrictions or imprisonment for up to three years.