Latest:
The Ukrainian military said on March 9 that Russian-backed separatists violated a cease-fire several times overnight.
The headquarters of the Anti-Terrorist Operation, as Kyiv calls the military operation againt rebels who hold parts of the Donetsk and Luhansk provinces, said that separatist forces fired on government positions 16 times between 8 p.m. and 6 a.m., mostly from mortars and grenade launchers.
It said most of the attacks were launched in the Donetsk province, where the rebels fired at Avdiivka and several other towns.
Fighting has eased substantially since the leaders of France and Germany brokered a deal on a cease-fire and steps toward peace in Minsk on February 12, rasing hopes for an end to the conflict that has killed more than 6,000 people since April.
But Ukraine has expressed concern the rebels may be using the cease-fire to regroup for possible new attacks.
More on the Obama-Tusk meeting later today:
Ahead of his meeting with Obama, Tusk said in an interview with The New York Times on March 8 that Europe was not yet prepared to step up sanctions against Moscow despite provocations by what he called the Russian "aggressor."
Here is today's map of the security situation in eastern Ukraine, according to the National Security and Defense Council:
