master

At a time when a growing number of countries were mastering the technologies for the production of fissile materials and nuclear devices, export controls and the safeguards system could never be foolproof in deterring all proliferation.
Alors que de plus en plus de pays maîtrisent les techniques de production de matières fissiles et d'engins nucléaires, le contrôle des exportations et le système de garanties ne seront jamais assez efficaces pour prévenir toute prolifération.
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