There are at least two things which does not fit into the version that the Russians who alive would do it:
1. They would not try to divert flight to other cities then.
2. They would not need it as this president was likely to lose next elections.
But it is only unofficial Russian version claiming so-called "diversions" to other cities. And revenge would fit, no?
"The crash also took an icon of Poland's Solidarity freedom movement,
80-year-old Anna Walentynowicz. Workers at the Lenin Shipyard in
Gdansk went on strike when Walentynowicz was fired from her job as
a crane operator in August 1980 for her opposition activity.
That sparked strikes that spread to other plants across the nation, giving
rise to the movement that helped bring about the demise of communism
in Poland nine years later."
--The Associated Press