Rebels gave Malaysian officials the data recorders from downed Flight 17 Monday, days after the passenger jet crashed in eastern Ukraine.
This comes as the United States is building a stronger case against Russian President Vladimir Putin.
The U.S. government is trying to determine whether Russian officials were at the scene when a missile downed that passenger jet, killing all 298 people on board.
The pressing questions tonight: who pulled the trigger? And were the Russians directly involved?
OutFront, the top Democrat on the House Foreign Affairs Committee, Congressman Eliot Engel.
A Buk missile, a type of anti-aircraft weapon is believed to have brought down Malaysia Airlines Flight 370.
But was it intentional? And how effective is its radar system?
OutFront, CNN military analyst Lieutenant Colonel Rick Francona.
U.S. Secretary of State John Kerry has arrived in Cairo in an attempt to negotiate a cease-fire between Israel and Gaza. Kerry said Monday the United States would provide $47 million dollars in humanitarian assistance to Gaza.
As the fighting rages on, the death toll continues to climb. Gaza health officials say about 565 Palestinians have been killed in the fighting, about 70 percent are believed to be civilians.
Israeli officials say two citizens and 25 soldiers have died. Among the dead soldiers were two Americans.
CNN's Polo Sandoval has more on why Americans are traveling to the Middle East to fight for Israel.
There were 298 innocent people on board Malaysia Airlines Flight 17, including 25-year-old Fatima Dyczynski.
She was flying to Australia to see her parents and start a new life in Perth.
I met Fatima Dyczynski and her parents at the 2013 IAC mtg. The very intelligent young space enthusiast was on MH17. http://t.co/Lb9n0no0Ok
— Leroy Chiao (@AstroDude) July 20, 2014
Fatima, an aerospace engineer was a promising young innovator. She even started her own company, and had lectured in Beijing about a new satellite phone app that kept families connected. Fatima loved kung fu, played guitar in a rock band, and was on her way to achieving her lifelong goal of becoming an astronaut.
Fatima didn't intend to be on that flight. In a tragic twist of fate, she missed the previous flight because of work.
Outfront, Fatima's parents: George and Angela Dyczynski.
More than four days after Flight 17 was shot down, there are growing concerns the black boxes handed over to investigators Monday were tampered with.
A train carrying car after car of bodies has finally made its way to the city of Kharkiv in Ukraine.
From there, the bodies will eventually make their way to Amsterdam - home to many of those on board MH17.
Kyung Lah is OutFront with more.