GLOBAL MARKETS-Stocks sag on Ukraine worries; gold, yen boosted by safety bids

* Yen builds on sharp overnight gains against dollar, euro

* Russian shares plummet before Sunday's Crimea referendum

* World stock index falls but U.S. stocks up slightly

(Updates prices, adds quotes, details)

By Caroline Valetkevitch

NEW YORK, March 14 (Reuters) - Growing tension between the West and Russia ahead of Ukraine's weekend referendum in Crimea pushed down stocks on major world markets on Friday and drove up buying of safe-haven gold and the yen.

Financial markets watched nervously as the West increasingly talked about sanctions and Russia hit back with promises of retaliatory measures and displays of military prowess. The vote being held on Sunday by pro-Moscow authorities is to determine if Crimea will join Russia.

Jitters also remained over the degree to which China's economy is slowing after unsettling data this week.

The MSCI global market index .MIWD00000PUS was down 0.4 percent and was on track for a loss of about 2 percent for the week, while gold prices reached their highest level in six months. Spot gold XAU= rose as much as 1.4 percent to its highest level since Sept. 9, and was last up 1 percent at $1,384.20 an ounce.

Moscow's MICEX .MCX index fell more than 5 percent before clawing back some of its losses to trade down 0.9 percent. The rouble RUB= was steady but close to recent record lows.

Href="NewsSearch">ID:L6N0MB1LI

Russia's central bank on Friday kept lending rates on hold after raising them two weeks ago and said it would fight for financial stability after the standoff with the West over Crimea. The Russian central bank said there would be no easing of rates in the months ahead, suggesting it expects more tough times ahead for the rouble and for stocks, which have lost about a quarter of their value since mid-February. News Search ID:nL6N0MB193

Part of the concern over the Crimea referendum on Sunday is that it could encourage other pro-Moscow parts of the country to follow suit and potentially embolden Russia in the region.

"There is a lot of anticipation about that Crimea vote coming up, so that is out there, a little bit of uncertainty," said Ryan Detrick, senior technical strategist at Schaeffer's Investment Research.

U.S. Secretary of State John Kerry met Russian counterpart Sergei Lavrov in London in last-ditch diplomatic efforts to defuse tensions, but Moscow and the West appeared increasingly far apart. News Search ID:nL6N0MB15L

Russia shipped more troops into Crimea on Friday and repeated its threat to invade other parts of Ukraine. A German newspaper reported that the chief executive officers of Russia's two largest firms are on a list of those who may be hit next week with European and U.S. sanctions over the Crimea crisis.

News Search ID:nL6N0MB1KJ

U.S. stocks edged up, a day after the S&P 500 posted its biggest loss since early February. The Dow Jones industrial average .DJI rose 17.05 points, or 0.11 percent, to 16,125.94, the S&P 500 .SPX gained 1.57 points, or 0.09 percent, to 1,847.91, and the Nasdaq Composite .IXIC added 1.988 points, or 0.05 percent, to 4,262.408.

The FTSEurofirst 300 .FTEU3 index of top European shares was down 0.6 percent. Shares of companies most exposed to Russia were under pressure, including Danish brewer Carlsberg

CARLb.CO , down 0.8 percent.

DOLLAR LOSING GROUND VS YEN

In the foreign exchange market, the latest developments in the Ukraine crisis sent the safe-haven yen soaring against both the dollar and the euro. The yen was headed for its biggest weekly gain in more than a month against the dollar.

The euro fell as much as 0.5 percent against the yen in early U.S. trading before trimming losses to trade 0.25 percent lower on the day at 140.88 yen EURJPY= .

Against the yen, the dollar fell 0.5 percent, to 101.36 yen

JPY= . On the week, the dollar has lost 1.7 percent, on track for its biggest losses since late January.

"I don't think anyone wants to hold any large risky positions going into the weekend," said Shaun Osborne, chief foreign exchange strategist at TD Securities in Toronto.

U.S. Treasuries prices edged higher on the Ukraine worries and after data showed a dip in U.S. consumer sentiment. The 10-year U.S. Treasury note US10YT=RR was last up 5/32 in price to yield 2.63 percent, compared with a yield late Thursday of 2.653 percent.

U.S. economic data showed consumer sentiment weakened in early March as an unusually harsh winter appeared to dim views on the economy's prospects.

Foreign central banks' overall holdings of U.S. marketable securities at the Federal Reserve plunged in the latest week, data from the U.S. central bank showed.

The Fed said its holdings of U.S. securities kept for overseas central banks sank by $106.142 billion in the week ended March 12, to stand at $3.206 trillion. The tumble brings the total on deposit with the Fed to the lowest level since December 2012.

In the oil market, Brent crude was up 87 cents at $108.26

LCOc1 a barrel, while U.S. crude futures CLc1 rose 67 cents to settle at $98.87.

<^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

GRAPHICS:

Asset returns last 12 months Href="Link">http://link.reuters.com/huq75s

Currencies v dollar Href="Link">http://link.reuters.com/tak27s

EM 2014 FX performance Href="Link">http://link.reuters.com/jus35t

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^>

With Russian assets continuing to slump, investors were taking the view that while the situation did not look good, Vladimir Putin and the Kremlin were unlikely to flinch.

"Obviously Russia will not back down so it all points to an escalation," Viktor Szabo, a fund manager at Aberdeen Asset Management who holds Ukraine and Russian bonds, said.

Copper, whose demand is seen falling as Chinese economic growth slows, edged higher but was on track for a 5 percent weekly loss.

Benchmark three-month copper CMCU3 on the London Metal Exchange traded up 0.84 percent at $6,469 a tonne in official midday rings, after sinking to a 44-month low of $6,376.25 on Wednesday.

"We have very bad headline risks now, including Ukraine, Russia, Venezuela, growth fears in China and elections in many large emerging economies," said Jorge Mariscal, chief investment officer of emerging markets at UBS Wealth Management.

(Additional reporting by Marc Jones and Clara Denina in London, and Richard Leong and Chuck Mikolajczak in New York; Editing by Louise Ireland, Chris Reese and Leslie Adler)

((caroline.valetkevitch@thomsonreuters.com)(+1 646 223 6393)(Reuters Messaging: caroline.valetkevitch.thomsonreuters.com@reuters.net))

 
((To read Reuters Global Investing Blog click on  
http://blogs.reuters.com/globalinvesting;  
for the Macro Scope Blog click on  
http://blogs.reuters.com/macroscope;  
for Hedge Fund Blog Hub  
click on http://blogs.reuters.com/hedgehub) 
((For the state of play of Asian stock markets please click on:   ))

Keywords: MARKETS GLOBAL/