I wrote a piece in May 2010 on this topic (one month after the tragic event of Smoleńsk tragedy), so I would like to refer you to that post: http://kiabakarisnippets.blogspot.com/2010/05/one-month-and-seventy-years.html
Please, say a prayer for the repose of the soul of my Grandfather.
I have still one thing to do - to go to Katyń Forest myself and to celebrate a Holy Mass for his and all those slaughtered there seventy six years ago... I truly ask the Lord for the grace of this journey to the grave of my Grandfather.
May he and all his compatriots buried in Katyń Forest and elsewhere in Russia - rest in eternal peace!