Crossing the border from Poland to the Ukraine is not difficult, but as it's not in the EU you can take it easy, because the queues are endless and people are in a rush, they say a rush but they aren't. To enter the country must fill in your information on a form, name, nationality, reason for the visit, vehicle registration. The border police then collect all the passports and review them all, it lasts a little over 2 hours! Taking pictures at the border is prohibited, but I could take some from the bus. Leaving was somewhat faster for us as we were lucky. As you cannot take more than a liter of polish vodka, a bottle of wine, a few bottles of beer and a carton of tabacco, it was hard to resist buying more than was allowed, especially with how cheap everything was,especially vodka (about 2 € a bottle of 700 ml) . We went by bus, so I just opened a suitcase and they let us continue, small cars, an exhaustive control. Before reaching the border there are alcohol shops so you can spend the Ukrainian money you have left, I was struck by the "Litr" logo that looked familiar though somewhat modified.