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Ongoing coverage of the confrontation between Russia, Vladimir Putin and the West over Russia’s aggression in Crimea and Ukraine.

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Ukraine Puts Army on Alert as Russia Heats Up Crimea Stalemate Ukraine Puts Army on Alert as Russia Heats Up Crimea Stalemate Ukraine Puts Army on Alert as Russia Heats Up Crimea Stalemate Ukraine Puts Army on Alert as Russia Heats Up Crimea Stalemate

Ukraine Puts Army on Alert as Russia Dispute Flares Up

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Ukraine's Nadiya Savchenko Swapped for 2 Russians: Lawyer

Ukraine's 'Joan of Arc' Swapped for 2 Russian POWs

SERGEI SUPINSKY / AFP - Getty Images
Ukraine's Embattled Prime Minister Arseniy Yatsenyuk Resigns

Ukraine's Embattled Prime Minister Resigns

Russia Jails Ukrainian National Hero Nadiya Savchenko for 22 Years

Ukrainian Military Pilot Nadiya Savchenko Faces Russian Verdict

Ukraine Topples Its Biggest Remaining Lenin Statue

Ukraine to Russia: We Can't Pay $3 Billion Debt We Owe by the Weekend

Ukraine Lawmaker Manhandles Prime Minister, Sparking Parliament Brawl

Biden Warns Ukraine of Backsliding on Corruption

Crimea Largely Without Power After Ukraine Transmission Tower Blasts

Why Ukraine's Ousted Autocrat Is Suing His Own Country

Russia and Ukraine: 9 Ways Neighbors Went From Friends to Enemies

Crimea, Ukrainian Province Annexed by Russia, Wants Its Own Beverly Hills

Europe's Other Migrant Crisis: 2M Displaced by Ukraine War

Russia Building Major Military Base Near Ukrainian Border: Report

Ukrainians Say They Face Torture, Show Trials in Russia

Ukraine Parliament Clashes Leave Cop Dead, 100 Others Injured

Russia's Classified Ukraine Crisis Death Toll Appears to Have Leaked

Russia's Sanctions War Against the West Explained

Ukraine Violence Spikes Despite Cease-Fire; U.S., Russia Trade Barbs

Shelling in East Ukraine Kills Four Civilians, Soldier

U.S. Sending Armored Combat Brigade to Europe Amid Russia Tension

Foul-Mouthed Governor Gets Results in War-Torn Ukraine

Pope Urges Putin to Commit to 'Sincere, Great Effort' for Ukraine Peace

Germany's Angela Merkel Urges G-7 Leaders to Send Russia 'United Signal'

East Ukraine: Five Servicemen Killed in Worst Violence in Months

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Intense Fighting In and Around Rebel Stronghold in Eastern Ukraine

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Biden Explains There Is a 'Practical' Side to Russia's Putin

Russia Is Boosting Air Defenses Inside Eastern Ukraine: State Department

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Putin: Ukrainian 'Armed Coup D'Etat' Is Unacceptable

Pro-Russian Journalist Oles Buzina Shot Dead in Kiev, Ukraine

Maryana Naumova, 'Strongest Girl in the World,' Trades Weights for World Affairs

Crimea Annexation Anniversary: Russia Parties, Beefs Up Military

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On The Streets Again: Pro-Russians Celebrate in Crimea

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Pro-Russian Crimeans Claim To Be 'Overflowing With Emotions'

Crimea One Year After Russia Referendum Is Isolated From World

Ukraine Crisis: U.S., Bulgaria to Begin NATO Military Drills

Russia Has Right to Deploy Nuclear Weapons in Crimea: Official

Russia Launches Large-Scale Military Exercises in Disputed Territories

Why Russia Has Jailed Female Ukrainian Pilot

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Once Gleaming Donetsk Airport in Ukraine Is Now Battered Husk

Ukraine and Rebels Start Pulling Back Heavy Weapons in Restive East

Russia's Detention of Ukraine Pilot Nadiya Savchenko 'Unacceptable': U.S.

Ukraine's Yatsenyuk Calls Russia's Putin a Threat to Civilization

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Ukraine's Prime Minister: 'Peace Is My Primary Target'

Putin Says All-Out War Between Russia, Ukraine Is Unlikely

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Ukrainian Chaos Reaches the One Year Mark

First Ukraine War Prisoner Exchange Completed

U.S., Allies Discuss New Sanctions on Russia Over Ukraine: Kerry

Vladimir Putin Says Russia's Military Might Has No Match

Russia's Putin Took European States 'By Surprise' in Ukraine: Report

Russia's Vladimir Putin Is Signing Deals With More Separatist Regions

U.S. Sends A-10 Thunderbolt II Aircraft Back to Germany Amid Russian Threat

Ex-Porn Star Sasha Grey Is Dragged Into Russia-Ukraine Propaganda War

Debaltseve Falls to Ukraine Rebels as Government Troops Retreat

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Ukrainian Government Forces Pull Back from Debaltseve

Some Pro-Kiev Forces Withdraw From Ukrainian Town of Debaltseve

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Palace of Culture Shelters Ukrainians From Conflict

Ukraine Truce Unravels as Fighting Rages in Debaltseve

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Mortar Fire Ruptures Gas Pipeline in Restive East Ukraine

Ukraine Town of Vuhlehirsk Comes Under Heavy Shelling Despite Cease-Fire

Ukraine Cease-Fire Largely Holds Despite Reported Shelling in Debaltseve

Break Accusations Fly After Ukraine Cease-Fire Begins

Fierce Fighting in Ukraine as Cease-Fire Deadline Approaches

Ukraine Fighting Rages as Cease-Fire Looms: 7 Troops Killed

Ukraine: 8 Troops Killed Despite Peace Deal, Looming Cease-Fire

Ukraine Conflict: Cease-Fire Announced by World Leaders in Minsk

Analysis: Ukraine War Escalates as Leaders Gather in Minsk for Peace Talks

Ukraine Fighting Rages Ahead of Russia Peace Talks in Minsk

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Fatalities After Shells Hit Bus Station in Rebel-Held Donetsk

Ukraine Crisis: Rockets Kill 7 in Kramatorsk Before Minsk Talks

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Rocket Fire Hits Soup Kitchen in Rebel-Held East Ukraine

Chemical Plant Near Donetsk, Eastern Ukraine, Hit by Explosion

Leaders Scramble to Avert 'Dramatic Spiral' in Ukraine

Kerry: 'No Doubt' Ukraine Will Get More Help

Kerry Insists 'There Is No Split' With Europe on Russia, Ukraine

Ukraine President Pushes for Fast Cease-Fire, Defensive Arms

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World Leaders Try to Ease Ukrainian War Tensions

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Kerry: 'No Doubt' More Assistance for Ukraine

Ukraine Peace Deal 'Uncertain' Warns Merkel as Violence Worsens

7 Things to Know About What's Happening in Ukraine

Joe Biden: Russia 'Cannot Be Allowed to Redraw the Map of Europe'

Merkel, Hollande Take Ukraine Peace Plan to Putin in Moscow

Kerry: We Will 'Not Close Our Eyes' To Russian Tanks in Ukraine

Army Commander Ben Hodges: Ukraine Crisis Needs More Than Weapons

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Weapons Only 'Not a Strategy' for Ukraine, U.S. General Says

Pro-Russian Rebels Appear to Take Hold of Ukraine Town of Vuhlehirsk

Shell Lands Near Hospital in Ukraine's Donetsk, Killing 3

Ukraine Violence Worsens as U.S. Weighs Arming Government Troops

'Active Discussions' in Administration on Arming Ukraine, Officials Say

Ukraine Peace Talks Collapse as Fighting Continues

Rebels Suffer Heavy Losses in Battle for Ukraine's Debaltseve

NATO Will Set Up Commands to Soothe Nervous Eastern Europe

Red Tape Traps Civilians in War-Torn Eastern Ukraine

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At Least Six Dead as Shells Hit Cultural Center, Bus in Donetsk

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Fighting Escalates in Ukraine's Separatist Eastern Regions

Seven Ukrainian Soldiers Killed in Worst Violence Since Cease-Fire

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Dramatic Dashcam Video Captures Ukraine Shelling