With accent marks:
Друзья́ познаю́тся в беде́.
You see your friends in the times of trouble.
This proverb is about a true friendship. It often happens in life that people have many friends who only call themselves friends. But should a disaster happen, only a few of them are ready to help.
The closest English equivalent is: "A friend in need is a friend indeed".
Other Russian proverbs
Forewarned is forearmed.
To live a life is not the same (not as easy) as to go through a field.
We don't appreciate what we have but we cry when we lose it.
You can't help grief with tears.
One head is good, but two ones are better.
A wolf is fed by his legs
(lit.) Whoever gets up early, God gives him
The best is the enemy of the good.