"By that, I mean above all humanitarian aid to the Syrian people, and help the regions where refugees living overseas can return to". "It is completely unacceptable for Kneissl to invite Putin privately to a party", he told Austrian newspaper Der Standard.
German Chancellor Angela Merkel and Russian President Vladimir Putin are due to meet on Saturday for their first bilateral summit in Germany since Russia annexed neighboring Ukraine's Crimea region four years ago.
The two leaders were scheduled to make statements before the talks, but there were no plans for a news conference afterward.
Ukraine is concerned that the Nord Stream 2 Baltic Sea pipeline from Russian Federation to Germany will transport gas that now flows through its territory and deprive it of crucial transit fees.
With Austria priding itself on neutrality, the invitation surprised many in Vienna and Moscow, particularly at a time when the European Union is at odds with Russian Federation over its annexation of Ukraine's Crimea region and other issues.
Putin arrives in Germany after a stop at an Austrian vineyard to attend Foreign Minister Karin Kneissl's wedding to entrepreneur Wolfgang Meilinger.
Merkel said the talks would also touch on the possibility of establishing a United Nations mission to help bring about peace in Ukraine.
The two leaders agreed in principle that Iran should exit Syria, according to the person, who discussed the matter on condition of anonymity.
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Addressing reporters outside Berlin's Meseberg Castle before their talks, Merkel said she would also raise human rights issues and bilateral relations.
Ukraine fears the pipeline will allow Russia to cut it off from the gas transit business, while Germany's eastern European neighbors, nervous of Russian encroachment, have also raised concerns about the project.
"I want to stress here that Nord Stream 2 is only an economic project and it does not close the door to the continuation of gas transit through the territory of Ukraine", he said.
With protesters audible Saturday outside the guesthouse in Meseberg, Putin also raised the issue of humanitarian aid and funding for global reconstruction in Syria.
Joerg Leichtfried of the opposition Social Democrats said Kneissl's decision to invite Putin was especially lamentable given that Austria now holds the rotating presidency of the European Union.
Speaking ahead of their meeting, the leaders touched on the ongoing conflict in eastern Ukraine, where fighting between pro-Russian separatists and forces loyal to the Ukrainian government has killed more than 10,000 since 2014.
"We must acknowledge that we do not have a permanent ceasefire", the chancellor said. Merkel said a four-way meeting on Syria involving Germany, Russia, Turkey, and France is possible.