A revenge killing by Kadyrov's supporters.
An attempt to discredit Kadyrov and deny him the possibility of becoming president of Chechnya by his enemies.
A hit by the same mobsters who threatened to kill her 2 years ago (she was given police protection at the time and then spent some time in London).
An anti-Putin provocation by his political opponents (not hard to figure out a couple of likely candidates).
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