But he maintained that Turkey had a right to defend its airspace and charged that Russian air activity near the Turkey-Syria border
has contributed to the crisis.
"This points to an ongoing problem with the Russian operations," Obama said. "They are operating very close to a Turkish border, and they are going after moderate opposition that are supported by not only Turkey but a wide range of countries."
Turkey said Tuesday it shot down the Russian plane with a missile strike after repeated warnings to the plane that it had flown over its territory.
Obama urged Russia and Turkey to communicate about the details of the operation in order to decrease the chance of escalation, a message the White House said Obama relayed in a later phone conversation with Turkish President Recep Tayyip Erdogan.
The downing of the Russian plane complicated Hollande's
visit to the White House, where he pressed Obama for greater global cooperation on battling ISIS
, including with Moscow. Obama appeared resistant to forming any new alliances in battling ISIS, saying he'd already convened more than 60 nations in a bid to curb the group's territorial gains in Iraq and Syria.
Hollande has openly called for a greater international effort to push back ISIS
, whose killing spree in Paris
two weeks ago was the worst terror attack on French soil in more than half a century.
He said Tuesday greater cooperation between the United States and Russia is required in battling ISIS, though persistent U.S. skepticism about Putin's intentions in Syria
have until now prevented any significant military coordination between the two countries.
"We want to gather all countries," Hollande said. "We do not want to exclude anyone."
But he also said Russia must pledge to target ISIS terrorists instead of moderate Syrian forces opposed to the government of Bashar al-Assad
, a requirement Obama also insisted upon during Tuesday's press conference.
"Russia right now is a coalition of two -- Iran and Russia -- supporting Assad," Obama said.
"Russia's the outlier," he added, noting that strikes against moderate opposition fighters "bolster the Assad regime."
Obama also cited the incident with Turkey as a reason for Russia to turn its focus to fighting only ISIS in Syria, saying that "some of those conflicts or potential for escalation are less likely to occur" if it narrowed its sights.
He said the encounter "underscores the importance of our moving the political track along as quickly as possible" when it comes to resolving the Syrian civil war, which ISIS has exploited to seize territory.
After the press conference, Vice President Joe Biden
told reporters gathered in the East Room that he believed "Putin is coming to the realization that Assad should transition out."
Without any major new commitments to announce alongside Hollande, Obama instead touted a new intelligence sharing agreement announced last week that has helped France target ISIS sites in Raqqa, Syria
. And he
called on Europe to do more to stop the flow of foreign fighters, share passenger lists and exchange information across borders.
Calling ISIS a "scourge" that "must be defeated," Obama said the U.S. stood with France after the brutal massacre in Paris.
"We'll deliver justice to these terrorists and those who sent them," Obama said. ISIS "cannot be tolerated. It must be destroyed. And we must do it together."
Later on Tuesday Obama convened his National Security Council to discuss counter-ISIS strategy. That amid a State Department-issued warning to travelers about potential terror threats. The White House said in a statement Tuesday night "the President was briefed that there is currently no specific, credible threat to the homeland from ISIL."
Hollande's visit to Washington comes amid a spate of jet-set diplomacy for the French leader. He'll meet with Russian President Vladimir Putin
on Thursday, and German Chancellor Angela Merkel
Wednesday. He met in Paris with British Prime Minister David Cameron
Obama, who returned from a week-long foreign swing on Monday, made clear in the aftermath of the Paris attacks he wasn't considering a change in strategy
, saying instead he was planning to intensify the U.S.-led coalition's air campaign in Iraq and Syria.
In his first press conference after the attacks, in Antalya, Turkey, Obama argued testily that alternative plans from Republicans ignored realities on the ground,
saying that his own interactions with wounded troops instilled a wariness toward war.
After coming under intense criticism for his response to the attacks, Obama turned up his rhetoric on ISIS Sunday
, saying during a press conference in Malaysia that his efforts to stamp out the group would succeed.
But he nonetheless departed Asia insisting the strategy he's utilized against ISIS is working -- and that other options, like sending in ground troops, aren't being considered.
The White House signaled Monday that it already believes U.S. contributions to the anti-ISIS effort are sufficient.
"The United States is certainly pulling more than our own weight when it comes to the contribution behind this coalition," White House Press Secretary Josh Earnest said. "That's something that we're glad to do. That is in line with the long tradition of American leadership. It certainly is a tradition that this president believes in."