A devastating blow to Poland: Demise of major representatives of the nation- What is your view?

Cautious critics would like to know more about the crash, an open investigation perhaps by UN (if it is made applicable as a policy for accidents involving high profile leaders in other country air spaces, waters, etc, it would be lot more credible) would help. Because the deceased was known conservative while the accident took place in Russion space. And Russions like any big power, are known for their own disposal of even their own jounalists whom they may perceive as threat to their interests in some way.