U.S. President Joe Biden said Thursday that Moscow would “pay a heavy price” for any Russian troop movements across Ukraine’s border.

The U.S. on Thursday escalated pressure on Russia, approving new arms transfers and accusing it of a plot against Ukraine.

Biden's suggestion that a "minor incursion" by Russia into Ukraine could spark a debate with US allies over consequences touched a nerve in Kyiv.

Ukrainian President Volodymyr Zelensky publicly pushed back Thursday on US President Joe Biden's comments that a "minor incursion" by Russia into Ukraine would prompt a lesser response than a full-scale invasion, in an implicit rebuke of Biden's comments.

Press secretary Jen Psaki said the U.S. response to an invasion would be “swift, severe, and united,” after the president said it would depend on the severity of Russia’s actions.

The US president says he thinks Russia's leader will "move in" but does not want a "full-blown war".

US secretary of state arrives in Kyiv to meet President Zelenskyy, as fears grow of imminent Russian invasion.

Russia denies any plan to attack Ukraine but tensions are high as troops mass near the border.

Seven bipartisan senators are in Ukraine to meet with President Zelenskyy and officials to reaffirm the U.S.' commitment to Ukraine as Russian troops amass at the border.

After a week of diplomatic talks ended with no progress, there are fears a Russian attack on Ukraine may become more likely.

Plus: Open source sabotage, Ukrainian website hacks, and more of the week's top security news.

Warnings that Russia may be looking for a pretext to invade Ukraine come as talks with the US and NATO have stalled.

The presidents of the US and Russia will speak again in a bid to de-escalate tensions over Ukraine.

The US military aircraft is designed to collect critical intelligence about the situation on the ground.

US and Russian presidents will discuss 'upcoming diplomatic engagements' amid ongoing tensions over Ukraine.

Caution from London comes as Putin calls for an 'immediate response' from Kyiv's Western allies over security demands.

Russian president also discusses US relations and the economy during marathon question-and-answer session.

The Russian leader welcomed talks with the U.S. that are set to start in Geneva next month, but warned the discussion focused on Moscow’s demand needs to produce quick results.

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @bellzits: @KyivIndependent @davidmotzko Please Share & RT The Geneva Convention on Warfare Common Article 3 is screenshot below & stat…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @Joyce_Karam: PM of #Greece K Mitsotakis delivered his harshest criticism of #Russia’s Putin today. “He will not succeed. He must be def…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @Independent: Putin warns of ‘irreversible’ damage if Europe bans Russian oil - follow live https://t.co/3CbMgOpagC

Pro-Russia Mayor of Ukraine's 'Crime Capital' Turns His Back on Putin https://t.co/Q8ZgD1DLVk

RT @KasraAarabi: “The free world that won the Cold War is remembering how to fight & rediscovering the values that give meaning to the figh…

RT @OccupyDemocrats: BREAKING NEWS: In a huge loss for Putin and the Russian economy, McDonald's announces that it is pulling out of Russia…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @OccupyDemocrats: BREAKING NEWS: In a huge loss for Putin and the Russian economy, McDonald's announces that it is pulling out of Russia…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @NBCNews: Video of Ukrainian soldiers allegedly on the border with Russia near Kharkiv is the latest in a string of setbacks for Russia…

RT @hrcberkeley: “We’re heading into an entirely new era of human rights investigations, and war crimes investigations more generally,” sai…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @SteveSchmidtSES: Worries about Putin’s global humiliation, Russia’s humiliation and pariah status miss the good news. Since Putin was a…

RT @60Minutes: “I feel it’s almost my duty, that when we’re faced with all this information showing terrible things that are happening, to…

Russia-Ukraine war live updates: Sweden, Finland move toward joining NATO; Western military exercises in region https://t.co/ACafDhYWV8

RT @nycjim: Governor of Kharkiv region says Ukraine troops have advanced to Russian border, suggesting new success in pushing out Putin’s f…

RT @expatua: Bellingcat on 60 Minutes https://t.co/OSGXX3Lm3I

RT @1zzyzyx1: Great job Putin, you are expanding NATO by your actions, perhaps if you’d leave Ukraine now, they may not join, kidding! Fin…

Russia-Ukraine live news: Putin warns Finland over NATO move Russian president warns Finland that joining NATO would have a 'negative impact on Russian-Finnish relations'. #News #DailyNews #LiveNews

RT @KWforUkraine: The Kremlin says the pictures of Russian atrocities in Bucha are fake news. The world knows better, based on confirmed ac…

RT @60Minutes: “We know that our database…will be used in…something like a Nuremberg trial,” Bellingcat executive director Christo Grozev t…

RT @KWforUkraine: The Kremlin says the pictures of Russian atrocities in Bucha are fake news. The world knows better, based on confirmed ac…

RT @SkyNews: "The West needs to get real about the size and scope of this problem." Melissa Haring of the Atlantic Council says the West s…

RT @nycjim: Governor of Kharkiv region says Ukraine troops have advanced to Russian border, suggesting new success in pushing out Putin’s f…

RT @ECOWARRIORSS: Considering that Putin holds ultimate power and is said to be gravely ill with blood cancer - calling in doubt his judgem…

Ukraine news live: Russia lashes out over Sweden and Finland joining NATO; Ukrainian troops 'reach Russian border' near Kharkiv; man recounts being 'buried alive' by Putin's forces https://t.co/JTFHuyhvwm

RT @60Minutes: “We're headed into an entirely new era of human rights investigations and war crimes investigations,” says Berkeley professo…

RT @60Minutes: “We know that our database…will be used in…something like a Nuremberg trial,” Bellingcat executive director Christo Grozev t…