The Armed Services leaders say "defensive military aid" would deter Russia.
NATO computers were targeted as early as December 2013, iSight said.
There are reports of fighting in Donetsk despite a cease-fire agreement.
NATO's senior military officer says Moscow could move to occupy eastern Ukraine permanently.
The European Union has negotiated a deal to ensure that Russia does not restrict Ukraine’s natural...
Critical to the effectiveness of sanctions is understanding the Russian perspective.
Obama thanked lawmakers “for the speed and seriousness" they brought to the issue.
The package includes $46 million for Ukraine's security forces, but no lethal aid.
The Ukraine crisis continues to undermine European investor and consumer confidence.
The official declined to identify the countries that are sending Ukraine weapons.
The penalties hit Russia's largest bank and many state-owned oil companies.
This is an important moment for the Obama presidency and for contemporary world history.
Medvedev mocked Obama for calling Russia's actions in Ukraine a threat.
The stars were aligned for Putin, but no longer.
The U.S. won’t send officials to a health summit on tobacco in Moscow.
A test case for a new relationship with Russia.
The cost of keeping the Ukrainian economy afloat will likely be higher than the IMF estimates.
The Obama administration must move beyond merely offering words of support to Ukraine.
“It’s a presidential decision. We can’t force it," the senator said.
Ukrainian President Poroshenko will address a joint meeting of Congress.
The U.S. is the world's most important practitioner of 19th-century great power politics.
Senior Democrats want Obama to announce increased military aid for Ukraine.
Obama said new penalties target areas important to Putin and people "close to him."
The alliance continues to ensure the peace and prosperity on the European continent.