President Obama said that despite repeated meetings with President Vladimir V. Putin of Russia on efforts to defeat the Islamic State, no one should be “under any illusions” that Russian forces would now start attacking the extremist group’s positions in Syria. The Russians have been deeply involved in propping up the government of the Syrian president, Bashar al-Assad, Obama said, adding that he believed their commitment to Assad was not going to shift anytime soon. He added that weeks of Russian airstrikes in the region had not led to substantial changes in the Syrian conflict and he said that at some point, Mr. Putin would recognize that he did not want to be involved in another quagmire. Progress is being made in the use of, from left, wind turbines, solar panels and water treatment to create energy savings. But one energy analyst, Jesse Jenkins, says, “I just don’t see a World War II-style mobilization happening for anything other than a world war.” On Mr. Obama’s last day at the international climate conference here, he and members of his administration also met with President Recep Tayyip Erdogan of Turkey at the residence of the United States ambassador here, a small palace that once was the home of Edmond James de Rothschild. Even though the two leaders had met two weeks ago at the Group of 20 summit meeting in Antalya, Turkey, Obama said another meeting was warranted in light of recent events in Syria and the shooting down of a Russian warplane by Turkey. “I want to be very clear: Turkey is a NATO ally,” Obama said. “Along with our allies, the United States supports Turkey’s right to defend itself and its airspace and its territory. And we’re very much committed to Turkey’s security and its sovereignty.”