A brazen attack by Islamist militants who killed at least 23 Tajikistan soldiers on Sunday is stoking concerns that the war in Afghanistan is spilling across the border into former Soviet Central Asia, destabilizing the already fragile governments there and endangering key coalition supply routes.

Tajikistan, an impoverished former Soviet republic that was ravaged by a civil war between a secular regime and the Islamist opposition in the 1990s, is particularly vulnerable. 

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