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Joe Biden is prepared to deploy more American troops to NATO countries if Russia invades the Ukraine, National Security Advisor Jake Sullivan said on Tuesday after the president's call with Vladimir Putin.
'There's no finger wagging but the president was crystal clear about where the United States stands on all of these issues,' Sullivan said, calling the two-hour conversation with Putin 'useful.'
Sullivan said if Russia goes on the attack that NATO partners on the Eastern front such as Poland and Romania, would be understandably concerned and the US would 'fortify' its allies along with providing 'additional defensive material for the Ukrainians.'
'In the event there's an escalation, our partners on the eastern front - Romania, Poland, other countries - will be increasingly concerned about the security and territorial integrity of their countries. They will be seeking, we expect, additional capabilities and potentially additional deployments and the United States will be looking to respond positively,' Sullivan said.
The administration has indicated for the past two days the US would step up its commitment to the NATO alliance in the face of Russian aggression in Eastern Europe. But officials have stopped short of saying the US will put boots on the ground in the Ukraine.
Meanwhile, former President Donald Trump said in a statement on Tuesday that the Russian president is 'not worried' about any threats or warnings from Biden.
'Vladimir Putin looks at our pathetic surrender in Afghanistan, leaving behind dead Soldiers, American citizens, and $85 billion worth of Military equipment. He then looks at Biden. He is not worried!' Trump declared in a statement via his Save America PAC. 
And, in its readout of the two leaders' call, the Kremlin said that Putin asked Biden for guarantees that NATO would neither expand in an Eastern direction nor deploy 'offensive strike weapons systems in the states adjacent to Russia.'  
But Sullivan, appearing in the White House briefing room after the leaders' video chat, made it clear the US planned to respond more forcefully than the Obama administration did in 2014, when Russia invaded and annexed the Crimean Peninsula from Ukraine.  
'I will look you into the eye and tell you, as President Biden looked President Putin in the eye and told him today that things we did not do in 2014 we are prepared to do now,' Sullivan told reporters. 
He did not offers specifics but said 'we would prefer to communicate that directly to the Russians, to not negotiate in public, to not telegraph our punches. But we are laying out for the Russians, in some detail, the types of measures that we have in mind.' 
The US imposed some economic sanctions on Russia in 2014 but to limited affect. American officials have said this time the US would apply 'strong economic measures' against Russia, including sanctioning its banks and limiting its ability to exchange currency. 
The US was quick to get out its version of the conversation after Russia released video footage of the first few minutes of the call, where Biden was seen waving to Putin and chuckling during what was supposed to be a tense conversation.
But the White House said Biden a tough talking to his Russian counterpart in their two-hour conversation and made it clear any invasion of Ukraine would be met with 'strong' economic sanctions and 'other measures.'
During the video chat, Biden 'voiced the deep concerns of the United States and our European Allies about Russia's escalation of forces surrounding Ukraine and made clear that the U.S. and our Allies would respond with strong economic and other measures in the event of military escalation,' the White House said in a readout of the call.
'President Biden reiterated his support for Ukraine's sovereignty and territorial integrity and called for de-escalation and a return to diplomacy,' the White House noted. There will be follow up conversations on the staff level.  
In the video footage, released by Russian news agencies, Biden is seen experiencing some technical difficulties, apparently forgetting to switch his microphone on. 
'Greetings Mr. President,' Putin said to Biden in Russian. 
There was silence on the other end and then Biden was seen leaning forward and fumbling with some buttons.
'There you go,' Biden said, suddenly audible. 
'Hello,' he added, chuckling and waving to his Russian counterpart. 'It's good to see you again.' 
Biden was also heard telling Putin during another short clip from there chat: 'We didn't get to see one another at the G20. I hope the next time we meet we do it in person.' 
The call started at 10:07 am ET, according to the White House. American press were not allowed to view the conversation. It ended at 12:08 pm the White House said. 
After the call ended, the White House released a photo of Biden in the White House Situation Room. 
In the White House photo, Biden is seen maskless at the head of a table, with a masked Secretary of State Antony Blinken and National Security Adviser Jake Sullivan on the sidelines. 
Putin was visible on the video screen, where he was on the call from his residence in the Black Sea resort of Sochi. It's the fourth direct conversation between the two leaders this year, following two calls and one summit in Geneva.   
After the conversation with Putin, Biden spoke with President Emmanuel Macron of France, Chancellor Angela Merkel of Germany, Prime Mario Minister Draghi of Italy, and Prime Minister Boris Johnson of the United Kingdom, according to the White House. 
The European leaders and Biden are closely coordinating on their response to Russia, should it pursue an attack on the Ukraine. 
'There is agreement about the need to impose strong and significant economic consequences if Russia were to invade Ukraine,' White House press secretary Jen Psaki said of the call with European leaders. 'Obviously, that may look different from country to country.'