Russia has fought two wars against Chechen separatism since the nineteen nineties.

VOA: special.2010.04.03

He spoke against black separatism.

VOA: special.2010.02.07

They also stressed that the region must stay vigilant against separatism, terrorism and religious extremism, China Daily says.

BBC: China media: North Korea sanctions

Steven Pifer, a visiting fellow at the Brookings Institution, says divisions between Ukraine's Russian- and Ukrainian-speaking populations are not nearly as significant as the ethnic separatism that plagues Georgia, and probably couldn't be used by Russia as leverage against Ukraine's government.

NPR: Georgia Crisis Stirs Concern In Ukraine