CHICAGO—CNA Financial Corp. said Thursday it entered into an agreement with RSA Insurance Group P.L.C. that will expand CNA’s global reach through RSA’s network.

The new relationship between the Chicago-based insurer and RSA, formerly Royal and Sun Alliance, will provide CNA’s U.S.-based clients with access to RSA’s global network, including India, South Africa, Australia and several Latin American countries.

CNA said in a statement that the agreement with London-based RSA does not discontinue its 16-year alliance with Italy-based Assicurazioni Generali S.p.A., but rather supplements it.

Through its international agreements with RSA and Generali, combined with CNA’s own network of branch offices, the insurer can offer international policies in 142 countries.

“RSA has one of the largest networks in the insurance industry, including presence in 34 countries and the capacity to cover risks in an additional 98 countries,” said Michael Dower, vp of CNA’s international underwriting unit, in a statement. “This agreement enables CNA to expand its global reach to serve the international business needs of our U.S. producers and customers.”