MONTERREY, Mexico--(BUSINESS WIRE)--Fitch Ratings has today affirmed Banco Santander Rio S.A.'s (Santander Rio) Viability Rating (VR) at 'ccc'. At the same time, Fitch affirmed Santander Rio's local currency (LC) long-term Issuer Default Rating (IDR) at 'CCC'. A full list of rating actions follows at the end of this press release. KEY RATING DRIVERS VR AND IDR Santander Rio's ratings are driven and constrained by the weak and deteriorating operating environment in Argentina, characterized by am