Putin ruled out any "preemptive nuclear strikes" at an global policy forum in Sochi on October 18, and said Moscow would only use nuclear weapons defensively, if early warning systems spotted nuclear missiles heading toward Russian Federation.
"There were more opportunities in one great, united, powerful state", he said.
Putin said SIS leaders had made demands but didn't say what they were.
The attack on the refugee camp came after an intense clash between ISIS and the USA -backed Syrian Democratic Forces.
"The Islamic State was controlling the camp for three hours and took the people hostage from the camp to inside the ISIS area", he said.
Putin said his meeting with Trump in Helsinki in July was positive and they had a "normal, professional dialogue" even though their exchange brought strong criticism from Trump.
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Harry, a military veteran, founded the Paralympic-style competition for wounded sick and injured service members in 2014. Britain's Prince Harry gives a thumbs-up as he climbs the Sydney Harbour Bridge in Sydney , Australia October 19, 2018.
He also praised Turkish efforts to set up a demilitarized zone in Syria's province of Idlib.
He said that "Turkish partners are doing all they can to fulfill their obligations".
The Russian nuclear doctrine allows for the use of this weapon in a conventional conflict, but only if Russia's existence is at stake.
Putin said Trump aims at "some sort of stabilization and improvement of U.S". He noted that Russian Federation would only launch a nuclear strike if its early warning systems spot missiles heading toward its territory, adding that "the aggressor should know that retaliation is inevitable".
"I want to tell all those who have fueled the arms race over the last 15 years, sought to win unilateral advantages over Russia, introduced unlawful sanctions aimed to contain our country's development: You have failed to contain Russia", Putin said during the state of the nation speech.
"We would be victims of an aggression and would get to heaven as martyrs", Putin said, while those who attacked Russian Federation would "just die and not even have time to repent".