President Barack Obama said Sunday the U.S.-led coalition “will not relent” in the fight against the Islamic State and was confident the terror group would be defeated, insisting the world would not accept the extremists’ attacks on civilians in Paris and elsewhere as the “new normal.”

Speaking at the end of the ASEAN summit in Malaysia, Obama also pressed Russian President Vladimir Putin to align himself with the U.S.-led coalition, noting that the Islamic State has been accused of bringing down a Russian airliner last month, killing 224 people.

"He needs to go after the people who killed Russia's citizens," Obama said of Putin

The president was wrapping up a nine-day trip to Turkey and Asia, where he met with Putin on the sidelines of the ASEAN summit.

Despite Russia ramping up its air campaign in Syria against ISIS, Obama said Moscow has focused its attention on the rebel forces fighting Syrian President Bashar Assad, a Russian ally. He called on Russia to make a “strategic adjustment” and drop its support for Assad. Obama said violence in Syria will not be stopped as long as Assad is in office.  

"It will not work to keep him in power," Obama said. "We can't stop the fighting."  

Nearly five years of fighting between the Assad government and rebels has created a vacuum that allowed the Islamic State to thrive in both Syria and Iraq. The militant group is now setting its sights on targets outside its stronghold, including the attacks in Paris that killed 130 people and wounded hundreds more.

French President Francois Hollande is scheduled to meet with Obama at the White House Tuesday to discuss ways to bolster the international fight against ISIS. Hollande will then meet with Putin in Moscow.

The discussions about a military coalition to defeat the Islamic State come amid parallel talks about a diplomatic solution to end Syria’s civil war. The violence has killed more than 250,000 people and displaced millions, sparking a refugee crisis in Europe.

Foreign ministers from about 20 nations agreed last week to an ambitious yet incomplete plan that sets a Jan. 1 deadline for the start of negotiations between Assad's government and opposition groups. Within six months, the negotiations are to establish a "credible, inclusive and non-sectarian" transitional government that would set a schedule for drafting a new constitution and holding a free and fair U.N.-supervised election within 18 months.  

The Paris attacks have heightened fears of terrorism in the West and also sparked a debate in the U.S. about accepting refugees from Syria. It's unclear whether any of the terrorists in the Paris attacks exploited the refugee system to enter Europe, though Obama has insisted that's not a legitimate security threat in the United States.  

"Refugees who end up in the United States are the most vetted, scrutinized, thoroughly investigated individuals that ever arrive on American shores," Obama said.

Still, the House passed legislation last week that would block Syrian and Iraqi refugees from entering the U.S. Democrats in large numbers abandoned the president, with 47 voting for the legislation. Having secured a veto-proof majority in the House, supporters are now hoping for a repeat in the Senate, while Obama works to shift the conversation to milder visa waiver changes that wouldn't affect Syrian refugees.  

Obama has focused his ire on Republicans throughout the trip, harshly criticizing GOP lawmakers and presidential candidates for acting contrary to American values. He took a softer tone Sunday, saying he understands Americans' concerns but urging them not to give into fear.  

He said the Islamic State "can't beat us on the battlefield so they try to terrorize us into being afraid."

Speaking dismissively of the Islamic State's global prowess, Obama said, "They're a bunch of killers with good social media."

The Associated Press contributed to this report.