Neighbor

My neighbor across the hall is a strange guy. I can't pinnpoint anything about him aside from the fact that he's Russian. The only reason I know this is when he dropped some groceries in the hall and I helped him pick it up, he said "Спасибо" ... I responded with "Пожалуйста", now everytime I see him it's "Привет", thats about my level in fluency in russian, but it seems to work.

I called him strange. I should explain. we live on the second landing, near A wooded area. Half the street is buildings, and the other side is woods. I see him all the time in the landing window that sits between our apartments, staring at the trees. He looks so scared when he stares at them.