Cost of living in Lviv (Ukraine) is 56% cheaper than in Arezzo (Italy)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 635 prices entered by 75 different people.
For example, to keep the same standard of living that would require €2,600 in Arezzo you would need to make just about €1,145 (37,863₴) in Lviv.