...Our ratings on United Bank for Africa PLC (UBA) are constrained by the sovereign credit rating on Nigeria. The 'B-/B' long- and short-term issuer credit ratings on UBA are constrained by the foreign currency sovereign credit ratings on Nigeria. The group's stand-alone credit profile of 'b+' reflects the 'b' blended anchor and the bank's strong business position. However, we do not rate Nigerian banks above the sovereign because of the likely direct and indirect influence of sovereign distress on bank operations, including the ability to service foreign currency obligations. We assess UBA's anchor at 'b', reflecting its exposure to a blended African economic risk score. We use our Banking Industry Country Risk Assessment's economic risk and industry risk scores to determine a bank's anchor, the starting point in assigning an issuer credit rating. The group is headquartered in Nigeria but has operations in 19 other countries in Africa. The 'b' anchor is based on our Nigeria industry risk...