Iran is now claiming that they did indeed shoot down the Ukrainian jetliner. But it appears that the Ukrainian jet may have been intentionally shot down: Those six airliners were two Turkish Airlines, one Austrian Airlines, one Pegasus Airlines, one Aeroflot, and one Qatar Airways. The downing of the Ukrainian jet was deliberate.

https://www.thegatewaypundit.com/2020/01/exclusive-did-iran-shoot-down-ukrainian-plane-on-purpose-new-evidence-suggests-this-may-be-the-case/