The East is East and the West is West; and never the twine shall meet
I hope you mean "twain" - or is this some subtle pun?!
Title of a ?80's epic movie by Oliver Stone based on a book of the same name, set against the backdrop of Vietnam from its post World War II liberation war against French, through the VietnamWar years, and end with "modern" Vietnam.
I saw it again in early 2004 after HarryPotter Chamber of Secrets which was enjoyable, but which is also HeavenAndEarth for comparison purposes.
Also the name of a beautiful computer puzzle game by ScottKim.