Donald Tusk has been accused of betraying Poland
The country’s defence ministry has accused the European Council President of working with Russian leader Vladimir Putin in the aftermath of a 2010 plane crash.
Then-president Lech Kaczynski, who is the brother of the leader of Poland’s leading Law and Justice (PiS) party, was among the 96 crash victims.
Now Mr Tusk has been accused of “abuse of trust in foreign relations" by the National Prosecutor's Office. Mr Tusk vehemently denies the allegations.
Defence Minister Antoni Macierewicz said today: “Tusk made an illegal contract with Vladimir Putin to the detriment of Poland and should bear criminal responsibility for that."
He claimed Mr Tusk failed “to guarantee the participation of representatives of Poland in all investigative activities on the site", which allegedly allowed Russia to limit the Polish role in the investigation.
Then-president Lech Kaczynski died in the plane crash seven years ago
Mr Macierewicz concluded: "It's not about negligence, it is about a criminal offence."
The alleged crime carries a sentence of one to 10 years in prison.
Russia has repeatedly refused Poland's demand to return the Tu-154 wreckage and its black box recorders, citing its own ongoing investigation.
96 people died in the plane crash in 2010
An earlier official investigation had concluded the deadly crash was nothing more than an accident an accident.
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Mr Tusk has dismissed these accusations as "purely about emotions and obsessions".
He said: “This is not a matter of legal or political nature, it is purely about emotions and obsessions.
Donald Tusk has been accused of allowing Russia to reduce Poland's role in the investigation
"Therefore, it is not within my competence to comment on cases like this one."
This move is the latest and most serious in an internal political row between PiS, led by the late president’s twin Jaroslaw Kaczynski, and Mr Tusk.
Poland was rebuffed at an European Union summit earlier this month when Mr Tusk was reappointed as Council president despite Warsaw's objections.