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Yes, and so do a few other countries like China. Plus most countries want to minimize volatility (and risk), so most likely we won't see national cryptocurrencies that behave exactly like, say, bitcoin or ripple. Here's my blog piece about national cryptos: https://steemit.com/cryptocurrency/@teacherdave/news-and-opinions-on-national-cryptocurrencies

You can add last rumors "Putin considers ‘cryptorouble’ as Moscow seeks to evade sanctions" https://www.ft.com/content/54d026d8-e4cc-11e7-97e2-916d4fbac0da