What is a court's duty to ensure that the attorney representing the client is aware of a potential conflict of interest situation?

When a potential or actual conflict of interest situation arises, it is the court's duty to ensure that the attorney's client, so involved, is fully aware of the nature of the conflict and understands the potential threat to the protection of his interests. Once the court is satisfied, however, that such a client knowingly and intelligently wishes to proceed with joint representation, the court's responsibility is met, and it is without power unilaterally to obstruct the choice of counsel. See Abraham v. United States, 549 F.2d 236 (2d Cir. 1976); United States v. Armedo-Sarmiento, 524 F.2d 591 (2d Cir. 1975).