President Barack Obama called Russia a threat to Europe peace this morning, specifically pointing out Moscow's aggression in Ukraine.
"You lost your independence once before," said Obama, following meetings with Baltic leaders in the Estonian capital of Tallinn, The Associated Press reported. "With NATO, you'll never lose it again."
Shortly after Obama's remarks, Russian President Vladimir Putin announced he and Ukrainian President Petro Poroshenko have agreed to a cease-fire, according to USA Today. The two leaders confirmed that a settlement plan will be finalized on Friday.
It's unclear what exactly will be in the settlement just yet, but a top Russian rebel told AP a cease-fire would be impossible, unless Ukraine withdrew their forces.
Other European countries surrounding Ukraine fear that if a settlement is made between the two countries, they will be targeted next by Russia.
The countries, including Estonia, Latvia and Lithuania, who are NATO members, are looking to the U.S. for help in case of an attack, the AP reported.
"We will defend our NATO allies - every ally," Obama said. "In this alliance, there are no old members or new members, no senior partners or junior partners - there are just allies, pure and simple. And we will defend the territorial integrity of every single one."