Military prosecutors are investigating allegations of secret illegal contacts between Polish and Russian intelligence officials during the period when Tusk was Poland's prime minister.
According to official investigations, the plane crashed after one wing broke when it clipped a tree while trying to land in poor visibility.
Last June, the total number of refugees in the world reached 65 million.
The sanctions, including travel bans and asset freezes, against Moscow were originally introduced in March 2014.
Some eurozone leaders back the idea of letting some member states push ahead with further integration without the whole bloc following suit.
Polish Prime Minister Beata Szydlo said it was unheard of to confirm a president without the consent of his home nation.
Tusk, a former PO leader, has wide backing among EU leaders for a second term, even though he faces strong opposition in Poland.
Leaders of four central European countries will meet next week to urge the EU to act against food companies which put inferior ingredients in branded products destined for sale in poorer member states.
One year ago, under its EU Rule of Law Framework, the European Commission began a dialogue with the Polish government designed to determine whether there was a systemic threat to the rule of law in Poland and prevent its escalation.
The majority of countries within the European Union are not ready to take advantage of the benefits of smart building technology, according to a recent study by the think thank Buildings Performance Institute Europe.