What is the significance of the song played at the end of Tangerines?

In the Georgian-Estonian film Tangerines (2013), at the end of the film as it rolls into the credits, what is the song that is being played? It sounds like a rock/alternative song. What was the context and significance of the song?

So after finding some English translations of the song it has become quite clear of the significance of the song.

From my understanding the gist of the song is about coming home to a loved one and the fact that the person singing can't stop thinking about them. “I will swim over the sea, Don’t listen to anybody else saying I won’t come, I will come back to you, I will return.” --So it no surprise Nika had a cassette with this song on it given he is in a war. Like DA said in the comments it was probably also put there for aesthetic purposes.