Jaroslaw Kaczynski has condemned the government's handling of the affair, and held his own rival events.
After nine months of bickering, Poland's new prime minister, Jaroslaw Kaczynski, won a vote of confidence this week.
People no longer equate Poland with the tantrums, paranoia and idiosyncrasies of the government led by Jaroslaw Kaczynski.
Mr Tusk defeated the government led by Law and Justice, headed by the president's twin, Jaroslaw Kaczynski, in 2007.
At their recent meeting the two leaders eased most of the tensions that were to the fore under Mr Tusk's predecessor, Jaroslaw Kaczynski.
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Many politicians from the opposition Law and Justice Party, which is led by Jaroslaw Kaczynski, the late president's twin brother, were among the delegation.
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In Poland's election, the Civic Platform party trounced the ruling Law and Justice party of the prime minister, Jaroslaw Kaczynski, who will now step down.
He starts at an advantage: he is not Jaroslaw Kaczynski, his predecessor and twin brother of the late president, Lech Kaczynski, who died in an air crash in Russia last year.
In Poland Jaroslaw Kaczynski, prime minister for 16 months from mid-2006, and his late twin brother Lech, who was president from 2005 to 2010, picked spectacular fights at home and abroad.
Poland's first years as an EU member saw a string of political crises as Lech and Jaroslaw Kaczynski, identical twins, shored up their conservative coalition government with radical nationalists and populists.
Its popularity has slumped, to 29%, barely ahead of the opposition Law and Justice (PiS) party led by Jaroslaw Kaczynski, which in previous years had been kept firmly at bay by PO.
The prime minister, Jaroslaw Kaczynski, the leader of the conservative Law and Justice (PiS) party removed all ministers belonging to Self-Defence and the Catholic-nationalist League of Polish Families (LPR), replacing them with PiS loyalists and non-party experts.
Meanwhile, Jaroslaw Kaczynski was leading unofficial commemorations.
But it lacks intellectual fire-power: its policies are flimsy and its two main figures, the twins Lech and Jaroslaw Kaczynski, are noted for their honesty, but also for their charmless stubbornness and limited grasp of foreign affairs and economics.
The government claimed that its tough negotiating tactics--the most controversial of which was Jaroslaw Kaczynski's claim in the run-up to the summit that a population-based voting system was unfair because 6m Poles had been killed by Germany during the Second World War--were effective in helping to secure a favourable deal for Poland.
Law and Justice's candidate in the contest is Lech Kaczynski, Jaroslaw's twin brother.
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