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
Russia-Ukraine Crisis: US intelligence has been closely monitoring troop, equipment and other moves in the region, while trying to factor in international events, like the Beijing Olympics
'They tell us Feb 16 will be the day of the attack. We will make it a day of unity,' Zelenskiy said in a video address to the nation
The Nikkei share average lost 2.23% to close at 27,079.59, posting its biggest daily percentage drop since January 27 and touching below the 27,000 level for the first time since January 31
Ukraine is not a NATO member but has a promise dating from 2008 that it will eventually be given the opportunity to join, a step that would bring the US-led alliance to Russia's border
Dutch airline KLM said it would halt flights to Ukraine and through the country's airspace, while Germany's Lufthansa said it was considering a suspension