U.S. Treasury bonds rose on Wednesday, as an upsurge in fears about Russia boosted investors' bid for "safe-haven" assets.
European shares closed lower on Wednesday, with investors reacting to disappointing data and escalating tensions between Russia and Ukraine.
Bonds turned as energy share lead a sharp stock market selloff, having earlier rallied after better-than-expected ISM data earlier.
U.S. stock index futures traded down on Wednesday, as European shares fell sharply on rising concerns about Russia and Ukraine.
Stocks fell sharply Tuesday, with traders citing uncertainty about Ukraine and concerns of higher interest rates.
U.S. stocks rose on Monday, with the S&P 500 rebounding from its biggest weekly drop since 2012.
Asian equities declined on Tuesday following disappointing economic data from China while central bank meetings in India and Australia were in focus.
The euro headed back below $1.34 on Tuesday after a survey of Italian service sector purchasing managers disappointed on the low side.
Asian equities followed their U.S. peers lower on Wednesday on worries that Russia-Ukraine tensions could escalate into a military conflict.
Gold soared past $1,300 on safe-haven buys triggered by worries that there could be an escalation of the military conflict in Ukraine.
U.S. oil ended at a new 6 month low despite data showing a further decline in oil stockpiles and a steep drop in gasoline inventories.
European benchmarks closed higher, although gains were capped by weakness seen in the Italian and Spanish markets.
Oil prices climbed after last week's steep drop, as investors shifted from supply worries to violence in North Africa in the Middle East.
The dollar held near an 11-month high, supported by upbeat U.S. data, while the New Zealand dollar took a hit from a fall in dairy prices.
Spot gold crawled higher on Tuesday, paring post-ISM losses, as energy shares dragged benchmark U.S. indexes to session lows; futures end lower.
Crude slipped as ample supply in the Atlantic basin outweighed worries that turmoil in the Middle East and Africa could disrupt production.
U.S. stock-index futures pointed to a weak open on Tuesday, with the ISM report likely to be the main feature of the session.
U.S. bond prices continued to rise on Monday and the yield curve steepened, after non-farm payrolls came in weaker than expected.
European shares pared gains to close mixed-to-lower on Monday, as investors reacted to earnings and the bailout of Banco Espirito Santo.
Brent crude held near $106 as ample supply continued to drag on prices after the benchmark posted its worst monthly performance since April 2013.
Get the best of CNBC in your inbox
Resolving the Russia-Ukraine dispute is critical. Here's the one person who can do that, says Jason Bordoff and Carlos Pascual.
Thanks to cheaper oil prices, Pacific Investment Management anticipates global growth to gain momentum in 2015.
In Fitch's ratings sytem, a "CCC" rating implies "default is a real possibility."