Daniel Costelloe is a senior associate in the international arbitration group at Wilmer Cutler Pickering Hale and Dorr LLP. Before this he held a W. M. Tapp Studentship in Law at Gonville and Caius College, Cambridge.

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• 1. Peremptory norms and their legal consequences as a feature of general international law; 2. Legal consequences for treaties; 3. Peremptory norms outside the Vienna convention: treaties of questionable validity by reason of their content; 4. Legal consequences for security council resolutions; 5. Legal consequences for certain unilateral acts; 6. Legal consequences in the law of international responsibility; 7. Legal consequences for state immunity; General conclusions.

Daniel Costelloe is a senior associate in the international arbitration group at Wilmer Cutler Pickering Hale and Dorr LLP. Before this he held a W. M. Tapp Studentship in Law at Gonville and Caius College, Cambridge.

Select Guide Rating

• 1. Peremptory norms and their legal consequences as a feature of general international law; 2. Legal consequences for treaties; 3. Peremptory norms outside the Vienna convention: treaties of questionable validity by reason of their content; 4. Legal consequences for security council resolutions; 5. Legal consequences for certain unilateral acts; 6. Legal consequences in the law of international responsibility; 7. Legal consequences for state immunity; General conclusions.

Daniel Costelloe is a senior associate in the international arbitration group at Wilmer Cutler Pickering Hale and Dorr LLP. Before this he held a W. M. Tapp Studentship in Law at Gonville and Caius College, Cambridge.

Select Guide Rating

• 1. Peremptory norms and their legal consequences as a feature of general international law; 2. Legal consequences for treaties; 3. Peremptory norms outside the Vienna convention: treaties of questionable validity by reason of their content; 4. Legal consequences for security council resolutions; 5. Legal consequences for certain unilateral acts; 6. Legal consequences in the law of international responsibility; 7. Legal consequences for state immunity; General conclusions.