Russia arms Iran, Venezuela, as well as any group / organization that causes problems with any of the western Democracies.
Russia has a history of alienating any country that was previously ruled under the Soviet Union system.
We have seen this behavior by Russia with regards to all the countries freed from Soviet despot rule, as with Estonia, Chechnya, Lithuania, Belarus, Poland, Georgia etc etc.
Russia cannot accept that it no longer rules these nations.
I have every sympathy for the relatives of those killed in this the latest attack, but I think that if any Country rules another Country against the wishes of the majority of the ruled Country's electorate, then they must realize that there will be resistance.
The man that Russia has installed to run Chechnya is a thug, there is not the slightest evidence he does anything without the express approval of Russia.