Worried about potential leaks, the EU informed each country only about the risks it would face, rather than sharing full details with all 28 member states.
The European Union has broadened its sanctions against Russia while the U.S. is “seriously considering" adding more sanctions.
Envoys from Russia, Ukraine, the European Union and the United States are scheduled to meet Thursday to discuss the Ukraine crisis.
Gunfire could be heard from the airfield at the town of Kramatorsk in eastern Ukraine; Ukrainian troops were seen disembarking from helicopters.
European Union diplomats said there was little prospect of a special summit to discuss additional sanctions because positions are so far apart.
The most serious East-West crisis since the end of the Cold War shows no signs of de-escalating.
NATO called on Russia to "de-escalate the crisis ... pull back its troops from Ukraine's borders, to stop destabilizing the situation."
Russia's intervention in Ukraine has Georgians worried about another Russia move - this time to the critical Caucuses land bridge.
Separatist groups that favor Russia have taken over Ukrainian government buildings in Donetsk, Lugansk, Kharkov and Slavyansk.
The interim government has yet to follow through with promises to use military might to retake eastern Ukraine.
IBTimes talks to Duke professor Campbell Harvey about the financial "nuclear option" that would have severe costs - for both sides.
The sanctions, not specified in the initial vote, will likely include more people under asset freezes and visa bans.
A Russian fighter aircraft made repeated, low-altitude passes near a U.S. ship in the Black Sea during the weekend, U.S. officials said.
Rebels in the eastern Ukraine town of Slaviansk Monday issued a bold call for Russian President Putin to help them.
Earlier, Russia's Deputy Premier Arkady Dvorkovich went to China as part of a delegation to discuss cooperation in the energy sector.
A U.K. envoy also said there was no doubt that Moscow was behind the destabilization of eastern Ukraine.
Foreign runners made their debut at Pyongyang’s annual marathon Sunday as North Korea sprinted toward its own ambitious tourism goals.
The State Department refuted 10 claims made by Russia about the ongoing Ukraine crisis in a harshly worded statement.
As the Ukraine crisis continued, condemnations were made Sunday night at an urgent U.N. Security Council meeting.
In what is being called an "act of aggression," pro-Russian activists seized government buildings and a police station, witnesses said.
Why the discrepancy?
Burger King Russia's CEO said the U.S.-based fast-food chain would be coming to Crimea soon, but Burger King Worldwide disagreed.