When I read the title of the article, I thought that it just shows installation of IC card.
But, when you see the detail, you'll find that NFC reader currently accepts Visa cards.
So, you can pass the exit by credit cards without buying tickets. I guess Minsk is the first metro which installed the system that allows passengers to use credit card itself as if it's an IC card ticket.
I'm looking forward to seeing expansion of the system around the world.