Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Iran converts uranium in defiance of UN on Saturday calling on Iran to suspend all activities related to uranium enrichment. The United States,. Russia and the European Union reinforced the message on Monday by urging Tehran to comply.

World