"Earlier this year, the U.S. surged 20,000 additional U.S. forces to Europe to strengthen our NATO Alliance in response to Russia’s aggression against Ukraine and the changing security environment," Biden said in a tweet after a three-day NATO summit in Madrid.
"We’ll continue to adjust our posture to ensure the defense of our Allies," he added.
"We’re working with Spain to increase U.S. Navy destroyers in Rota, establishing a permanent HQ in Poland, putting an additional rotational Brigade Combat Team in Romania, enhancing our Baltic presence, and sending two more F-35 squadrons to the UK," Biden also said after the summit.
He tweeted on Thursday that "NATO is ready to meet threats from all directions, across every domain: land, air, sea, cyber and space."
'We are going to support Ukraine as long as it takes'
Biden said in Madrid on Thursday that the United States would provide a further USD 800 million worth of military aid to Ukraine.
He added that the new US security assistance package would include air defence systems, artillery, ammunition and counter-battery radar.
"We are going to support Ukraine as long as it takes," Biden declared at a press conference in the Spanish capital.
A day earlier Biden announced that the United States would boost its military presence in Europe and create a permanent headquarters for its Army V Corps in Poland in response to threats coming from Moscow after Russia's invasion of Ukraine.
Friday is day 128 of Russia's war in Ukraine.
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Source: PAP, CNN