President Obama said at least one American citizen had been killed in the Malaysia Airlines crash in Ukraine in a speech from the White House on Friday.
The U.S. State Department confirmed the citizen as Quinn Lucas Schansman, a dual national Dutch/American citizen.
The president also indicated that evidence points to the plane having been shot down by a surface-to-air missile from the separatist-controlled area of eastern Ukraine. He added that these separatists have received "a steady flow of support from Russia," including arms, training, heavy weapons, anti-aircraft weapons.
U.S. markets were unfazed by the speech, climbing slightly to new session highs. (Click here for the latest on the markets.)
Read MoreTimeline of MH17 tragedy
Obama emphasized that an immediate course of action must include a "credible international investigation" into the incident.
"We don't have time for propaganda, we don't have time for games, we need to know exactly what happened," he said.
He also placed some of the blame for the incident on Russia.
"Time and again Russia has refused to take the concrete steps necessary to deescalate the situation," Obama said. "I spoke to President Putin yesterday in the wake of additional sanctions that we'd imposed. He said he wasn't happy with them, and I told him that we have been very clear from the outset that we want Russia to take the path that would result in peace in Ukraine, but so far at least, Russia has failed to take that path."
The president said he does not see a U.S. military role beyond what is currently being done in working with its partners in the region, and that any positive change in the region may require cooperation from Moscow.
"The violence that is taking place [in eastern Ukraine] is facilitated in part—in large part—because of Russian support, and they have the ability to move those separatists in a different direction," Obama said.
In response to a question about further U.S. and European sanctions against Russia, the president said that the incident "certainly will be a wake-up call for Europe and the world that there are consequences to an escalating conflict in Eastern Ukraine." He also discussed earlier sanctions, saying that a "relevant consideration" is to minimize their effect on America and the global economy.