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
What goes around comes around.
Оne can not see the wood for the trees.
Start taking care of the dress while it's new, and of your honor while you are young.
Do not dig a hole for another one, you will fall into it yourself.
In a quiet whirlpool, demons live.
Better late than never.
Get your sleigh ready in summer and your (horse-drawn) cart in winter.
Put your trust in God, but don't make mistakes yourself