* Army leadership spilt between Hutu and Tutsi
* Burundi facing worst political crisis since end of war
By Patrick Nduwimana
BUJUMBURA, Feb 17 (Reuters) - Burundi's national army said on Monday it would not intervene in the worst political crisis to grip the east African country since a 12-year civil war ended nearly a decade ago.
Burundi, which has a complex power-sharing system ...