Russia may have broken the 20-year-old Budapest Memorandum, which protects Ukraine's integrity, and NATO could decide to react.
Falling German investment and trade with Russia is only partly to blame for the economy's recent faltering.
Russian hackers are believed to have hacked JPMorgan Chase and stolen a trove of executives' "sensitive documents."
The international community decides what to do as NATO and Ukraine provide evidence of a Russian incursion into Ukraine.
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.”
A video shows a convoy of tanks, which Ukraine and the U.S. claim are from Russia, moving through Luhansk.
Artillery, troops and armor attacked Ukrainian forces along the Sea of Azov, from a position locals say could only be reached from Russia.
Struggling to recover from the disasters of MH370 and MH17, Malaysia Airlines has been hit with allegations of an in-flight assault by a crew member.
With sanctions and bans affecting key sectors, the growth forecast for 2015 has been halved.
The official downsizing plan will be announced this week, but sources said routes to China and Europe would be eliminated.
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.
Allen Weh is standing by his campaign ad, which has sparked outrage for including footage of James Foley's killer.
A Russian defense ministry official said that the soldiers had most likely crossed the border "by accident."
Three convoys of weapons reached Ukraine from Russia three times in the past week.
The president spent two weeks in Martha's Vineyard as American journalist James Foley was beheaded and the situation in Ferguson unraveled.
Ukrainian border guards managed to turn back a rebel armored column near Novoazovsk.
Companies that have business relations with Russia are, on average, more pessimistic than those that do not have them.
Russia’s announcement comes just a day after pro-Moscow rebels in eastern Ukraine paraded dozens of captured Ukrainian soldiers.
The country marked its Independence Day holiday with a parade of military vehicles, some battle-tested, through a Kiev square.