[another_kel]

They don't work «just fine». They only work within russia. You can't pay for any foreign stuff wit it, you can't even pay in the app store.

People who can afford it literally travel to Belarus\Kazakhstan for a weekend just to get a debit card that works worldwide.

[postsantum]

Only a small fraction of russians needs to pay online for foreign stuff. Besides that, UnionPay cards are available, you can use them to withdraw money in most countries and shop online sometimes