Putin was already committed to his current program in Syria before the crash occurred and he doesn’t feel the need to justify his actions before a wworld that began messing in his backyard in Ukraine and then causes more trouble near his Southern borders.
That’s my point - he committed to something which was not stable as the source of Russian revenue .... its not working and someone may be upset with the little guy. No one in Russia cares about his justifications, if he were to make them.
Everything else is not germane - its the money.