...Support Drives IDRs: Societe Generale Expressbank AD's Issuer Default Ratings (IDRs) and Support Rating reflect Fitch Ratings' view of extremely high probability that the bank would be supported, if required, by its almost 100% owner, Societe Generale S.A. (SocGen, A/Stable/a). The Stable Outlook on the bank's Long-Term IDR mirrors that of SocGen. Strategically Important Subsidiary: Expressbank is based in a strategically important region for SocGen. The bank's synergies with its parent are strong and underpinned by long record of supporting SocGen's objectives and a high level of management and operational integration. The almost full ownership underpins owners' support propensity. We believe that any required support is likely to be immaterial relative to the ability of SocGen to provide it. Moderately Strong Standalone Profile: The challenging domestic operating environment weighs on the bank's Viability Rating (VR), despite its largely robust capital buffer, moderate risk appetite,...