According to the FATF Recommendation 12, financial institutions should take reasonable measures to determine whether the beneficiaries of a life insurance policy and/or, where required, the beneficial owner of the beneficiary are politically exposed persons. This should occur at the latest at the time of the payout1. The purpose of this requirement is to prevent the abuse of life insurance products for money laundering or terrorist financing by PEPs or their associates. Therefore, the best way to mitigate the risk of adding a beneficiary to a life insurance policy for a foreign PEP is to perform due diligence on the beneficiary, such as verifying their identity, relationship with the PEP, and source of funds2.
The other options are not correct because they either do not comply with the FATF standards, or do not adequately address the risk of adding a beneficiary to a life insurance policy for a foreign PEP. Determining the source of wealth and source of funds is a measure that should be applied to the PEP as the customer, not the beneficiary, as part of the enhanced due diligence process2. Declining the request if the beneficiary is a foreign PEP may not be feasible or proportional, as not all foreign PEPs are involved in money laundering or terrorist financing, and some may have legitimate reasons to add a beneficiary to their life insurance policy.
Declining the request to add a beneficiary due to increased risk may also not be feasible or proportional, as it may violate the contractual rights of the PEP as the customer, and may not be necessary if the due diligence on the beneficiary does not reveal any red flags or suspicions.
References: https://complyadvantage.com/insights/peps-life-insurance/
https://www.cfatf-gafic.org/index.php/documents/fatf-40r/378-fatf-recommendation-12-politically-exposed-pers

This action is the most appropriate because it demonstrates the local manager's responsibility and accountability for the sanctions compliance program. Sanctions screening is an important part of the Know Your Customer (KYC) and Anti-Money Laundering (AML) processes, as it helps to identify and prevent transactions with sanctioned individuals or entities, which could expose the financial institution to legal, regulatory, and reputational risks. Failing to perform sanctions screening could result in violations of sanctions laws and regulations, which could lead to fines, penalties, sanctions, or even criminal prosecution. Therefore, the local manager should immediately inform senior management of the issue, so that they can take corrective actions, such as implementing screening procedures, conducting a risk assessment, reviewing existing customers, reporting any potential violations, and providing training and guidance to the staff.
The other actions are not appropriate because they either do not address the root cause of the problem, or they could worsen the situation. Starting screening new customers without informing senior management could create a false sense of compliance, and it could also miss the existing customers who may be sanctioned.
Immediately informing the regulators without informing senior management could undermine the trust and communication within the organization, and it could also trigger an investigation or enforcement action before the issue is resolved internally. Doing nothing because the department only handles a very small number of mortgages could be a sign of negligence or indifference, and it could also expose the financial institution to significant risks, as even one transaction with a sanctioned party could have serious consequences.
References:
CAMS Certification Package - 6th Edition | ACAMS, Chapter 4: Developing and Implementing an AML Training Program, pp. 97-98 CAMS Certifications: How to Get CAMS Certified | ACAMS, CAMS Study Guide, pp. 76-77 What is Sanctions Screening and How Does It Work? | Jumio, Introduction and Benefits of Sanctions Screening Sanctions Screening: Challenges and Control Considerations, Background and Regulatory Expectations for Sanctions Screening Sanction Screening: A Complete Guide | KYC AML Guide, What is Sanction Screening and Why is it Important?