After weeks of saying the US wasn't sure if Putin had made the final decision to launch a widespread invasion, Biden said that assessment had changed
The Kremlin declared massive nuclear drills to flex its military muscle, and President Vladimir Putin pledged to protect Russia's national interests against what it sees as encroaching Western threats
Gold retreated slightly on Friday as a potential Russia-US meeting cooled some nerves about a rise in the Ukraine conflict, but the recent rally set bullion up for a third straight weekly gain.
Safe-haven Japanese yen fell back on Friday and the Australian dollar advanced as investors took comfort from news of talks between the United States and Russia over the crisis in Ukraine.
US and European stock futures bounced back on Friday and selling pressure on Asian shares eased after the US Secretary of State agreed to a meeting with Russia's foreign minister, over Ukraine crisis.
Kyiv and the pro-Russian separatists have been facing off for eight years, and a ceasefire between them is routinely violated, but the intensity of fighting increased notably this week
No Russian delegation will attend the conference, the Kremlin said last week - the first no-show in years, underscoring how much East-West relations have deteriorated
Investors fear a wider war as one of the deepest crises in post-Cold War relations plays out, with Russia wanting security guarantees, including Ukraine's never joining NATO
The Senate acted as a midnight Friday deadline loomed, when existing funds were set to expire for operating most of the federal government
Russian diplomats who have stayed longer than three years must leave the United States, while Moscow is giving US diplomats less time, a State Department spokesperson said
After a handful of positive signals from Russia that eased tensions earlier in the week, the pendulum appeared to be swinging in the opposite direction again
Russia's defense ministry said Wednesday its forces were pulling back after exercises near Ukraine, and published video that it said showed forces leaving the Crimean peninsula
Russia says video shows tanks leaving Crimea; Britain and US say pullout has yet to be confirmed
The video, published by the RIA news agency, showed dozens of military vehicles crossing the bridge at night
But beyond the Ukraine tension, the oil market remains tight and prices are still on course for a move towards $100 a barrel, analysts said
In a nationally televised speech, Biden said the United States estimates that 150,000 Russian troops now encircle Ukraine, a higher number than previous estimates of about 100,000
He said he told Russian President Vladimir Putin during their phone call on Saturday that the US is willing to 'keep pursuing high-level diplomacy' to negotiate 'written understandings' with Russia
Stating that any such move by Russian President Vladimir Putin will prove to be a 'self-inflicted wound', Biden warned Moscow that the US and its allies will respond 'decisively'
Russia's Interfax news agency said that while large-scale drills across the country continued, some units of the Southern and Western military districts have started returning to base
Sanctions could disrupt payments to leasing firms, and any retaliatory move by Moscow to restrict access to Russian airspace might throw east-west trade into chaos