Van Rompuy says new sanctions against Russia will be drawn up within a week.
Ukraine President Petro Poroshenko solicited EU support Saturday during discussions of his country's conflict with pro-Russian separatists.
"I want to remind you that Russia is one of the most powerful nuclear nations. This is a reality," the Russian president said Friday.
After more than 20 years as an independent country, Ukraine looks to join NATO. Other ex-Soviet nations already have.
The separatists say they will allow civilians and government troops who lay dow their arms to leave, following a request from Vladimir Putin.
Russian hackers are believed to have hacked JPMorgan Chase and stolen a trove of executives' "sensitive documents."
The currency switch is a protective measure for Russia, since U.S. dollars can be tracked and controlled by American officials.
Ukrainian President Petro Poroshenko has confirmed that Russia has breached its borders and hinted at a possible international response.
Russia has denied Ukraine's claims and said that it's not involved in “Ukraine hostilities.”
The Ukrainian leader sounds a hopeful note after a summit meeting.
The meeting in Minsk started off with an icy handshake between the leaders of Russia and Ukraine.
A Russian defense ministry official said that the soldiers had most likely crossed the border "by accident."
Russia’s announcement comes just a day after pro-Moscow rebels in eastern Ukraine paraded dozens of captured Ukrainian soldiers.
German Chancellor Angela Merkel met with Ukraine President Petro Poroshenko during Kiev visit Saturday.
Western nations condemned Russia's decision to send the convoy into Ukraine without the permission of the Kiev government.
The Russian and Norwegian firms had already entered into a drilling agreement worth up to $4.25 billion in July.
Ukraine fears that the convoy may be smuggling weapons to separatists, while Russia insists its motives are humanitarian.
The eurozone economy is suffering as companies are banned by sanctions from selling certain goods to huge Russian market.
The restaurants were closed for 'sanitary violations,' but Russia has a history of banning food products from countries it has disputes with.
Ukraine estimates that more than 2,000 people have been killed in the clashes while nearly 300,000 have been displaced.
U.S. Air Force Gen. Philip Breedlove says military force would be used to keep Russia from pulling another Crimea.
City shelled heavily as Russia dismisses claims of invasion pretext.