This week's list of top stories in fintech: How Visa-Mastercard Russian bank ban will disrupt commerce On Monday V & MC blocked access to their networks for a large share of Russian market Did not name specific banks but three banks make up 50% of the market There are 300m credit and debit cards in Russia V & MC control 72% of card market there Russians have to rely now on cash primarily, although getting money from ATMs will be difficult War in the time of crypto Crypto is flowi...