The illegal Kosovo war and the Genocide Convention
The simple answer to your not-so-simple question is that it doesn't. Article 1 of the Genocide Convention —
The Contracting Parties confirm that genocide, whether committed in time of peace or in time of war, is a crime under international law which they undertake to prevent and to punish
Any Contracting Party may call upon the competent organs of the United Nations to take such action under the Charter of the United Nations as they consider appropriate for the prevention and suppression of acts of genocide or any of the other acts enumerated in Article 3
Thus "the obligation to intervene" (not a word used anywhere in the Convention) is not an obligation as such, but an option, and the option must obviously be interpreted in a way that is in conformity with the UN Charter, which is specifically mentioned.
Two other points that might have got our old pal Jamie into a spot of difficulty, had he been asked about Kosovo and the Genocide Convention:
1. Even if there was a conflict [which there isn't] between the obligations imposed by the Genocide Convention and the UN Charter respectively, Article 103 of the Charter makes it crystal clear that the Charter obligation would prevail.
2. However badly the Serbs were behaving in Kosovo before the NATO attack on Yugoslavia, nothing they were doing came anywhere near the definition of 'genocide' in Article 2 of the Convention. Virtually all the acts of brutality against the Kosovo Albanians committed by the Serbs before the NATO bombing began were reactions, often culpably disproportionate, to acts of violence by the KLA which (however much you sympathise with the Kosovo Albanians) fit any conceivable definition of 'terrorism' like a glove. There's no evidence of any intention on the part of the Serbs to eliminate physically the entire Albanian population of Kosovo — anyway a numerical impossibility, even for the Serbs — nor even to drive them out of the province, which they only started doing after the NATO attack on Yugoslavia began.
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As a post-script to that, it's worth noting that Mr Shea holds the following positions in addition to his central role in the NATO secretariat: * Professor, Collège d’Europe, Bruges
* Lecturer, Brussels School of International Studies, University of Kent
* Associate Professor of International Relations, American University, Washington DC; Director of the Brussels Overseas Study Programme
* Adjunct Associate Professor of International Relations, James Madison College, Michigan State University
* Director of the MSU Summer School in Brussels.
It would be interesting to know how he answers penetrating questions from his students about the illegality of the Kosovo war, its failure to achieve any single one of its various proclaimed objectives, the fraudulent character of the Rambouillet conference which preceded the NATO attack, the failure even to seek UN authority for the use of force (still more the failure to obtain it), and the appalling incompetence of the NATO bombing (hitting refugee convoys, the Chinese embassy, television studios, bridges and power stations, as well as killing thousands of innocent civilians, all to no possible purpose). Perhaps 1999 is too long ago for Mr Shea's students to know of these crimes and blunders; they have all probably swallowed, without chewing, the now conventional wisdom according to which Bush's and Blair's Iraq may have been a dreadful mistake, but Clinton's and Blair's Kosovo was a stunning and legitimate success. But Mr Jamie Shea was only doing his job, and one has to admit that he did it spectacularly well, as no doubt he still does.