“In these days we were holding remembrance ceremonies together, mourning the victims of totalitarian times. Lech Kazcynski was coming to Russia to personally pay tribute to the killed Polish officers, both as a President and as a citizen of his country.

“All Russians share the grief and sorrow with you. I promise this tragedy will be investigated in the most thorough way in closest co-operation with the Polish side.

“I’ve given comprehensive instruction to Russian law enforcement agencies.

“On behalf of all the Russian people, I want to express our deepest and sincerest condolences to the Polish people, or compassion and support to the loved ones and relatives of those killed. On Monday, April 12th, Russia will mark a national day of mourning,” Medvedev said.