"I have ordered [the military] to secure the defense of Mariupol with howitzers, multiple rocket launchers, tanks, anti-tank weapons and air cover," Poroshenko told steel workers in the port on the Sea of Azov near the Russian border.
The new U.N. human rights chief urged world powers on Monday to protect women and minorities targeted by Islamic State militants in Iraq and Syria, saying the fighters were trying to create a "house of blood.
Russia has pledged to strike back, hinting at a ban of all EU flights over Russian territory.
Home Depot hasn't confirmed it's been hacked, but researchers think they've identified the suspects already.
The U.N. says the 298 victims of MH17 should count toward the total death toll in Ukraine.
EU had earlier said that new sanctions, targeting Russia's defense and oil companies, could be announced if the cease-fire fell through.
Under the radical $1.9 billion overhaul unveiled last week, MAS said it would shed nearly a third of its 20,000 workforce.
The German automaker said the decision was based on Russia's faltering economy.
"In some ways, we are solving a non-existent problem because we can't solve the existing ones," a Western defense official, speaking on condition of anonymity, said as the 28-nation summit ended on Friday.
Witnesses saw plumes of black smoke filling the sky on Sunday morning, in a further test for a cease-fire that is barely 40 hours old.
Rebels also say that many elements from the cease-fire deal, brokered by the OSCE, are not acceptable to them.
Prime Minister Tony Abbott said Saturday that a memorial for the missing MH370 victims is being planned on Australia's west coast.
The Ukrainian military and the Kiev authorities have denied the claims, saying that there has been no fighting in the region.
NATO sought to reaffirm its relevancy in a post-Cold War at its Wales summit.
Obama also said in a speech in Wales on Friday that NATO would implement a readiness action plan to monitor the situation in Ukraine.
Pro-Russian separatists in Ukraine said on Friday a cease-fire agreement with Ukraine had been reached. The stand-down starts immediately.
NATO's secretary-general made it clear that a "rapid response" force is a necessary measure to curb Russian aggression in Ukraine.
Negotiators for Ukraine and pro-Russian rebels are near a cease-fire in Minsk, Belarus, but not much has changed.
Russia's largest arms manufacturer, which increased production five-fold this year, is now on a U.S. sanctions list.
The Ukrainian military is reportedly preparing for an imminent rebel attack before a potential cease-fire starting Friday at 7 a.m. EDT.
A Twitter account belonging to the Russian Embassy in the United Arab Emirates has trolled the NATO summit with a sarcastic tweet.
Rebel forces appear to be making a final push prior to a cease-fire agreement set to take effect on Friday afternoon.