Explainer: What's behind the standoff between Ukraine's two intelligence agencies?

Intelligence summary

The violent standoff between Ukraine's Security Service (SBU) and the military intelligence agency (HUR) on Sept. 2 exposed two dysfunctions of Ukraine's law enforcement and security system. One is the long-running conflict between the two intelligence agencies: although competition among secret services is common worldwide, shootouts that result in injuries are far more troubling than a routine institutional rivalry. The conflicts between Ukraine's two security agencies "have gotten out of co