Senator Charles Schumer had some strong words for Russian President Vladimir Putin the day after Malaysia Airlines Flight 17 was shot down.
"One way or the other, sadly, it looks like President Putin has blood on his hands," Schumer said. "There's only one bit of good that can come out of this tragedy. The one bit of good that can come out of this tragedy is if Mr. Putin realizes that he's playing with fire."
Schumer said Russia should join the U.S and Western Europe in working for a free and democratic Ukraine.
Schumer linked the incident to what he considers the ongoing problem of Russian aggression.
"Putin should learn his lesson and immediately stop arming the separatists, encouraging them, and mobilizing troops at his border to threaten a free Ukraine," Schumer said.
President Barack Obama said at least one American citizen was killed when the plane was shot down in Eastern Ukraine.
He's calling for a cease-fire in the area and an international investigation.
Obama said a missile fired from an area controlled by pro-Russian separatists brought down the plane, which was carrying nearly 300 people.
He also said Russia has been supporting the rebels with arms, training and anti-aircraft missiles.
The president is blaming Russia, saying it's failing to take a path to peace in the region, but he cautioned against drawing conclusions before a United Nations Security Council investigation is complete.
"We're working with the entire international community to make sure that the focus is on getting to the bottom of this things and being truthful," Obama said. "And my concern, obviously, is that there's been a lot of misinformation generated in Eastern Ukraine generally. This should snap everybody's heads to attention and make sure that we don't have time for propaganda, we don't have times for games. We need to know exactly what happened, and everybody needs to make sure that we're holding accountable those who committed this outrage."
Obama called Ukraine's president from Air Force One Thursday.
On Friday, he offered the services of the FBI and the National Transportation Safety Board to help the investigation.
The FAA is prohibiting American flights in the airspace over eastern Ukraine.