Is it possible to enter EU countries with an old passport but with a visa, and then, when the visa expires, leave the EU already on a biometric one? Is it possible to use two passports on the same trip?

According to the results of the consideration, we inform you that as of June 15, 2017, the departure from Ukraine and the entry into Ukraine of citizens of Ukraine are carried out in accordance with the Law of Ukraine “On the procedure for leaving Ukraine and entering Ukraine of citizens of Ukraine” (hereinafter — the Law) according to the documents specified in Article 2 of the Law, namely: the passport of a citizen of Ukraine for travel abroad, diplomatic passport, service passport, seaman's identity card, crewmember's certificate, identity card for return to Ukraine (gives the right to enter Ukraine), as well as other documents provided for international treaties of Ukraine.