Ukraine's embattled prime minister resigns

Arseniy Yatsenyuk had been under fire over the worsening economy and slow pace of reforms

• Apr 10, 2016

Russian court convicts Ukrainian pilot, so she sings

Nadezhda Savchenko was serving in a Ukrainian volunteer battalion against Russia-backed rebels when she was captured by separatist rebels

• Mar 22, 2016

NATO's challenges coming "quickly and with complexities"

U.S. defense chief heads for key meetings on future of trans-Atlantic alliance and how to fight ISIS, as NATO tries to "adapt itself"

• Feb 9, 2016

Putin rattles Russia's saber with massive military drills

Thousands of troops and hundreds of planes in southwest Russia tested for their readiness amid continuing tensions with West

• Feb 8, 2016

America's "powerful signal to allies" -- and Russia

Obama to quadruple spending to $3.4B on military support for European allies, aimed at "deterring Russia from further aggression"

• Feb 8, 2016

"Re-tooling an army from scratch," as it fights a war

U.S. and allied forces try to equip Ukrainian soldiers to stay alive and hold their ground in the grinding fight against Russian-backed rebels

• Feb 1, 2016

Brawl breaks out in Ukraine Parliament

Lawmakers scuffle amid collection of signatures for resignation of unpopular PM Arseniy Yatsenyuk

• Dec 11, 2015

Biden visits Ukraine with a warning for its leaders

U.S. Vice President voices West's growing impatience with pace of reforms to tackle corruption

• Dec 8, 2015

Flight 17 downed due to "the detonation of a warhead"

The Dutch Safety Board says there is no doubt a Russian-made missile shot from eastern Ukraine brought down the Boeing 777 with 298 on board

• Oct 13, 2015

Obama, Putin to meet at UN next week

The two leaders have not met in almost a year amid tension over Russian intervention in Ukraine

• Sep 24, 2015

BBC journalists among those black-listed by Ukraine

Kiev bars hundreds deemed a security threat from entry, but gives no explanation as to why British network singled out

• Sep 17, 2015

Putin scrambles military units near Ukraine

Snap drills are latest in a series of Russian war games amid tensions with the West over Ukraine

• Sep 7, 2015

Grenade blast in Ukraine protest violence kills 1

At least 100 others were wounded during demonstrations over separatist powers in the eastern area of the country

• Aug 31, 2015

Despite 6-month-old cease-fire, Ukraine fighting rages

Fresh shelling between Russia-backed separatist rebels and Ukrainian government troops kills at least nine; talks keep breaking down

• Aug 17, 2015

Ukraine replaces entire police force to beat corruption

Kiev enlists American help to train new force, disbanding old patrol after years of allegations of bribery and harassment

• Jul 24, 2015

Joint Chiefs nominee: Russia is top threat to U.S. security

Marine Gen. Joseph Dunford tells Congress Russia's recent behavior is "nothing short of alarming"

• Jul 9, 2015

U.S. sending arms to answer "Russia's provocations"

Defense chief Ash Carter tells CBS News that America will bolster NATO's deterrent force with military muscle

• Jun 23, 2015

Carter laments Putin's "loose rhetoric" on nukes

U.S. defense chief, planning "strong but balanced" response to Russia with NATO allies, says there was "no need" for Putin to tout new missile plans

• Jun 22, 2015

Putin: Ukraine war not our fault, U.S. must stop meddling

Russian leader tells Charlie Rose rebels in neighboring country will "always find arms somewhere," and insists it's Kiev that is prolonging the crisis

• Jun 19, 2015

Delicate balance for Pope Francis as he meets Putin

Russian leader shunned by much of West over Ukraine crisis welcome at Vatican, but will Francis turn up the heat?

• Jun 10, 2015

Monitor: Ukraine cease-fire violations on the rise

The mission monitoring the cease-fire warned about heavy weapons missing, rockets and launchers being used

• Jun 6, 2015

Ukrainans claim proof of Russians leading separatist forces

While Russia insists that any of its soldiers seen in Eastern Ukraine were not active duty, officials there say thousands are leading the rebellion

• Jun 4, 2015

Vladimir Putin shut out of G-7 summit, but little else

Russian president remains a central player in world affairs, despite Western leaders' pledge to isolate him over Ukraine

• May 31, 2015

Russia seeks release of alleged soldiers from Ukraine

Putin spokesman says Russia "is taking all necessary measures" to free men from captivity

• May 22, 2015

Russian captured in eastern Ukraine: "I'm alive and well"

Russia denies 2 men, who were wounded and captured in rebellious eastern Ukraine, are members of its armed forces

• May 19, 2015

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