Just a few examples for you to show the cultural difference

A typical dialog between a purchaser and a shop assistant.

In US:
- Hi! (informal!)
- Hi!
- How are you doing?
- I'm fine. How are you?
- I'm fine too! May I help you?
- Yes, I'd like ...

In Russia:
- Здравствуйте! (formal!!!)
- Здравствуйте! Что вы хотите? (What do you want?)
- Мне нужно... (I need ...)
No "как дела"!!! It would be completely strange in this situation!!!

A typical dialog between friends.

In US:
- Hi!
- Hi!
- How are you doing?
- I'm fine!
- Great!
- How are you?
- I'm very nice!
- ... (meaningful conversation starts here)

In Russia:
- Привет! (informal!)
- Привет!
- Как дела? (meaningful conversation starts here)
- Да вроде всё хорошо! Вчера я ходил в бассейн. Потом посмотрел новый фильм! (Well, looks like everything's nice! Yesterday I was at a swimming pool. Then I saw a new movie!) - А как у тебя? (And what's about you?)
- У меня не очень. Кажется, я заболел. Горло болит. (I'm not so nice. It seems I feel sick. I have a sore throat.)

I hope you get what I mean