Mr Putin promised action on Syrian refugees, saying "we must do everything" to help them return home.
Putin arrived in Germany on Saturday evening after a stop at an Austrian vineyard to attend Foreign Minister Karin Kneissl's wedding to entrepreneur Wolfgang Meilinger.
After Trump met Putin while attacking Merkel and the German economy, Janning says, "she needs to have her own contact with Putin".
Merkel, hosting Putin for their first bilateral talks in Germany since 2013, opened by telling him that Russian Federation has an elevated responsibility to step up and help solve a range of conflicts, notably Syria and Ukraine.
Ukraine worries that the Nord Stream 2 Baltic Sea pipeline from Russian Federation to Germany will transport gas now flowing through its territory and deprive it of crucial transit fees.
"Russia is an worldwide actor without whom the solution of various issues is unthinkable", Steffen Seibert, Merkel's chief spokesman, told reporters in Berlin on Friday.
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 the Crimea region from Ukraine, and other issues.
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Putin also spoke about worldwide reconstruction efforts and the humanitarian situation in Syria.
The United States is pressing Germany to halt work on the pipeline, arguing that it will increase Germany's dependence on Russian Federation for energy.
Yet the foreign ministry insisted that Putin's visit "will not change anything in terms of Austria's foreign policy positions".
The comments came ahead of a meeting between the two leaders at a German government guest house outside the capital, Berlin.
Earlier this month, a Russian suggestion that the United States and Russia form a joint group to finance infrastructure renovation in Syria was met with an icy reception, according to a USA memo seen by Reuters.
"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. But she was appointed to her job by the far-right Freedom Party (FPO) which has a cooperation agreement with Putin's United Russia party.
Putin visited Austria in June on his first trip to the West after being re-elected as president.