English is the most important foreign language, being widely taught and spoken mostly in the south, a former British colony. There are a significant number of Russian speakers, originating from Yemeni-Russian cross-marriages occurring mainly in the 1970s and 1980s. A small Cham-speaking community is found in the capital city of Sana'a, originating from refugees expatriated from Vietnam after the Vietnam War in the 1970s.