What do Financial Action Task Force (FATF)-style regional bodies do for their members to help combat money laundering and terrorist financing?

To ensure compliance with economic sanctions established by governmental authorities in the jurisdictions where it operates, a financial institution requires that all new and existing customers be screened at onboarding and quarterly thereafter.
Is this step sufficient to ensure compliance?

Which three elements should be considered in an institution's enhanced due diligence process to assure itself that it has secured sufficient understanding of its higher risk respondent bank customers according to the Wolfsberg Principles on Correspondent Banking?

In many jurisdictions, financial institutions are prohibited from hiring a person who has been convicted of what type of offense?

On what basis are international sanctions imposed against entities?