Russia: US air defense systems could be targets in Ukraine

WATCH: This leads to the brink of nuclear war with Russia

2 American soldiers captured in Ukraine may be executed by Russia

WATCH: Trump reveals how he would handle Putin’s nuclear threats

Moscow threatens to break last diplomatic ties with US

WATCH: Ukrainians celebrate arrival of Russian troops, Moscow claims

US should ‘bomb the s***’ out of Russia, Trump tells Republican donors

Alleged Russian spy worked for US government news agency

US citizens urged to leave Russia immediately

Kamala Harris ridiculed for childish explanation of Russian invasion

WATCH: Former Ukraine envoy weighs in on Putin’s nuclear ‘red button’ warning

WATCH: Russian invasion of Ukraine ‘made in China’

WATCH: Ukrainian president showing true ‘courage, leadership,’ says US congressman

Did Putin just threaten America with a nuclear strike? – analysis

WATCH: Russian invasion would not happen under Trump, senator says

Biden: US will not fight Russia

WATCH: Putin has made ‘declaration of war’

Biden-Putin summit discussed but fears of Ukraine war remain

EU chief: Russia could be cut off from markets, tech goods

Harris on Ukraine: World at ‘a decisive moment in history’

‘Unprovoked’: As war looms, Russia expels US diplomat in Moscow

WATCH: Biden dodges questions on Russia-Ukraine conflict

Israel walks between the drops amid Russia-Ukraine tension

WATCH: ‘You should leave now,’ senator warns Americans in Ukraine

‘ISRAELIS ARE RIGHT’: Biden’s latest move causing ‘nuclear breakout,’ says senior US army veteran

WATCH: Could this be the most significant conflict since WW2?

WATCH: US to respond ‘decisively’ if Russia invades Ukraine

US and Russia ‘coordinating closely’ in Iran talks

US intelligence finds Russia planning Ukraine offensive

US perplexed as fears grow Russia may invade Ukraine

Russia destroys old satellite, blamed by US for threatening space station

Russia moves former US Marine to solitary confinement in Soviet-era gulag

WATCH: Biden says Putin is a ‘killer’, has ‘no soul’

Netanyahu: Israeli military operating ‘360 degrees’ against Iranian threat

WATCH: Netanyahu leads historic US-Russia-Israel security meeting focused on Iran and Syria

Opinion: A tale of two meetings – Netanyahu, Putin and Trump 

US Congress, Israel oppose ‘game changer’ fighter jet deal with Turkey

WATCH: US and allies release joint statement blaming Russia for chemical attack

WATCH: Obama official says calling Trump team’s Russian contacts illegal a ‘stretch’

Report: US, Russia near agreement on resolving Syrian civil war

US, Russian air forces clash over Baltic

US, Russian air forces clash near Alaska