Gold ended higher as investors added it as an insurance before a key vote in Crimea over the weekend to decide whether the region will join Russia.
U.S. bonds inched higher on Tuesday as concerns returned over the situation in Ukraine.
Gold settled lower after briefly touching a six-month high as appetite for risk remained cautious following Crimea's vote to break from Ukraine.
Stocks rallied on Monday as the voting in Crimea passed without violence and after U.S. manufacturing output jumped.
European stocks closed higher on Monday as the Crimea vote passed without violence and following positive U.S. data.
Crude oil fell sharply as concerns eased that fighting could erupt after Crimea voted to join Russia, and focus returned to fundamentals.
Asian stocks started the week mixed as concerns escalate over Ukraine after exit polls from a weekend referendum showed Crimea voting to join Russia.
Stocks declined on Friday as concern escalated about Ukraine.
U.S. stock index futures signaled a higher open to the week, as markets appeared to shrug off referendum ramifications in Crimea.
U.S. crude rose as traders watched Ukraine's crisis, but gains were curbed by domestic supply builds and lower demand in the U.S. and China.
Fears the crisis in Ukraine could intensify led traders to the safe havens of the Japanese yen and Swiss franc.
Asian shares traded mixed late Thursday. Domestic data lifted Australian stocks, while weaker-than-expected Chinese economic data limited gains in Shanghai.
The yen heads for its biggest weekly gain in more than a month against the dollar, on tensions in Ukraine and the Chinese economy.
Asian equity markets sold off sharply across the board on Friday amid a flight-to-safety.
U.S. stock futures turned higher Tuesday after Russian President Vladimir Putin said in a speech that he does not want Ukraine divided further.
European stocks closed lower on Thursday, continuing a volatile week that has been dominated by concerns over China and the Ukraine.
U.S. oil rose as constructive data fanned hopes for the recovery, but Brent was hit by growing fears about China's economy.
U.S. stocks declined on Thursday, after the S&P 500 came less than four points from its record close.
U.S. stock index futures pointed to a slightly higher open on Friday following a selloff Thursday, but this weekend's referendum in Crimea could keep a lid on gains as investors start fretting over the fallout of the vote.
Gold managed to log a modest gain on Thursday after stronger-than-expected US jobs and retail sales data lifted the dollar off early lows.
Get the best of CNBC in your inbox