One does not wash one’s dirty linen in public.
More Russian Proverbs:
The poorer, the more generous.Russian
Having given your word, be strong; not having done it, try not to promise.
Russian
To know that candles are expensive is of no value to the blind man.
Russian
Death is not found behind mountains but right behind our shoulders.
Russian
Eggs don't teach the hens anything.
Russian
Happiness is not a horse, you cannot harness it.
Russian