Traveling from Riga to Malbork Castle

I would like to rent a car and drive from Riga to Klaipeda, Lithuania for the first night; along the coast through Kaliningrad, Russia to Malbork Castle, Poland for the second night; to Vilnius, Lithuania for the third night; and then back to Riga. I figure with a rental car it will be faster, and not that much more expensive than a bus. What difficulties will I encounter at the Russian border? Reply to this

Thanks. I guess I will just go around Kalinengrad. Reply to this