The Sunda Straits Crisis was a two-week confrontation between the United Kingdom and Indonesia over the passage of the Illustrious-class aircraft carrier HMS Victorious through the Sunda Strait, a major waterway separating the Indonesian islands of Java and Sumatra, occurring between August and September 1964. The incident was part of the larger Indonesia-Malaysia confrontation, an armed conflict between Indonesia and Malaysia (with the military support of Britain) over the formation of the latter as an independent state.