WARSAW (Reuters) - Poland's defense minister has accused European Council President Donald Tusk of working with Russia's Vladimir Putin to harm Polish interests following the 2010 plane crash that killed President Lech Kaczynski and 95 others.

The ministry notified the military department of the National Prosecutor's Office on Monday that it suspected Tusk, who was Polish prime minister at the time, of an "abuse of trust in foreign relations".

The move was the latest, and possibly most serious, in an internal political row between Poland's ruling right-wing Law and Justice (PiS) party and rival Tusk.

Poland was isolated and rebuffed at an European Union summit earlier this month when Tusk, a centrist, was reappointed as council president over Warsaw's objections.

A spokeswoman for the prosecutor's office in Warsaw confirmed it had received the ministry's notification, which effectively accuses Tusk of diplomatic treason. It now has 30 days to decide whether to investigate.

Tusk dismissed the accusations as "purely about emotions and obsessions".

"This is not a matter of legal or political nature, it is purely about emotions and obsessions," he said in emailed comments. "Therefore, it is not within my competence to comment on cases like this one."

The PiS is led by Kaczynski's twin brother Jaroslaw, Poland's most powerful politician and a longstanding opponent of Tusk.

Lech Kaczynski died when in a plane carrying a Polish delegation crashed approaching Smolensk Air Base in Russia

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