Poland marks the first annivesary of the plane crash which killed President Lech Kaczynski and 95 others today.
The Polish First Lady has already laid a wreath at the crash site in Smolensk, Russia, amid a deepening rift between the two countries over what caused the tragedy.
Poles reject a Russian report blaming the pilots while clearing Russian ground control. The plane crashed in thick fog.
Around a thousand people demonstrated outside the Russian embassy in Warsaw yesterday, calling Russian premier Vladimir Putin a murderer and their own prime minister a traitor.
It is a far cry from the initial post-crash rapprochement between the two nations.
The crowd then marched to the presidential palace. The chant there was for President Bronislaw Komorowski, who is due in Moscow tomorrow, to stay there.