Ok, so I can tell you first-hand that the first experience when you enter Belarus by train is middle-aged women smuggling raw meat under their coats from Poland to Belarus. Agriculture is ineffective (still very much kolkhoz style) which leads to higher consumer prices.
Living blocks (ΠΎΠ±ΡΠ΅ΠΆΠΈΡΠΈΡ) and general infrastructure (roads etc) are in poor state, obviously underfunded.
One huge difference as compared to Russia is lack of visible corruption.