Given that Americans like to replace OU with O [colour > color, labour > labor, favour > favor, etc] shouldn't you be changing ROUBLE to ROBLE, not RUBLE?<p>At least be consistent in your English language mangling!
Previous discussion about the drop of value: <a href="https://news.ycombinator.com/item?id=30494626" rel="nofollow">https://news.ycombinator.com/item?id=30494626</a>