Upon further checking we do capture some ISIN or SEDOL or CUSIP numbers where possible, see statement below, please check World-Check profile of "UNITED COMPANY RUSAL PLC" as an example, the ISIN can be found from the Key Data or details section:
World-Check provides data on securities on sanctioned entities that is obtainable within the open source domain or within our Thomson Reuters product databases. If information is accessible we will include it within our records. At present, our coverage for Russia and Venezuela is the most expanded due to content availability.
World-Check adds International Security Identification Number (ISIN) data where possible, provided the ISIN is still active on the date the entity or its parent was sanctioned or if it was issued on or after the sanctions date, regardless of maturity length.
Thank you for your inquiry, not sure if i have understood your question correctly but WC1 API is a KYC/AML tools providing name screening due diligence against your customers, beneficiaries, suppliers and so on for PEPs, financial criminals, sanctioned personnel, etc not for Bonds though, correct me if i am wrong please?