you can use it, but it is not recommended to use it with a domestic card tied. It is not 1% red, and there is a very small chance. Now you can't register Argentina with Qiyou, but Russia can.

You don't have to use paypal. yandex is the safest. yandex can pay with your credit card. The problem with paypal is that it will be paid not only by steam card but also by paypal card.