Nostalghia is in many ways about distances: both physical distances which separate us from our loved ones and emotional distances between people. Tarkovsky is sure that a person can not live a life of solitude, and all of us need communication. At the same time, he is saying that building close relationships is probably the most difficult thing to do for a person.
In the film, Gorchakov is trying to emotionally connect with his interpreter — Eugenia (Domiziana Giordano) — but the feelings are not even spoken out loud, and their love story is never finished. And there is no one to blame because they were people of two different worlds that were never meant to get close despite the time they spent together. Tarkovsky says that "Nostalghia is about the impossibility of people living together without really knowing one another, and about the problems arising from the necessity of getting to know one another." Relationships and communications between people are important, but there are some walls that simply cannot be broken. Some things, such as language, historical background, and cultural heritage exist as a part of our identity, and people of other cultures simply cannot appreciate it.
"We Russians claim to know Dante and Petrach, just as you Italians claim to know Pushkin, but this is really impossible — you have to be of the same nationality. The reproduction and distribution of culture is harmful to its essence and spreads only a superficial impression." — Tarkovsky almost says that people are doomed to not understand each other. The perception of another person is always false. Those thoughts Tarkovsky puts directly into the mouth of his protagonist. When Eugenia wants to discuss the Russian poems which she read in Italian, Gorchakov states that translation never carries the essence of a piece of writing. And despite his attraction to Eugenia, when she asks, "How can we get to know each other?", his answer is "By abolishing frontiers between states." Surely, he is aware that it is impossible, but feeling the physical separation from his homeland and his loved ones makes him think about it. What he does not realize is that such thoughts only push him to create artificial barriers which isolate him from physical reality.