Can I ask you whether you think there's a possibility that this was arranged by a Russian Oligarch (or multiples of them?)

Sure, the Ukrainians and their allies would have reason to want Alexander Dugin dead over his statements about their identity and statehood, destablizing other countries, or simply to damage at Putin because Dugin is so important to his decision making process but hear me out...

You can argue that Dugin is a both a big reason for both the war in Ukraine and for other sanctions on Russia as the mind behind "Foundations for Geopolitics" and the resulting playbook and ideology. Seems to me that what the Oligarchs would want us a stable relationship with the global economy combined with lack of interference in Russia's internal affairs, so from that standpoint the war in Ukraine could be a bridge too far for them.