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: Rwanda Troops Start AU Mission in Darfur (Reuters) Reuters - Rwandan troops arrived in\Darfur Sunday as the first foreign force there, mandated to\protect observers monitoring a shaky cease-fire between the\Sudanese government and rebels in the remote western region.

World