The thing about Belarus is not that laws change at whim. They are not. According a lawyer I know from Belarus in courts small and not so small cases are considered rather fairly. One in principle can count that in a daily life rule of laws applies and the level of corruption is not that bad.

But the moment your case is perceived by authorities as political or somebody with power finds your business interesting, one gets BIG troubles. Now, by playing by the rules one can protect somewhat from the "business" interests, so the situation is better than, for example, in Russia. But political part is very unpredictable and it is impossible to know which action can cross the line.