* China's soybean imports notch first annual drop since 2011
* Weaker-than-expected Chinese trade data rattles investors
* Wheat falls as Russia confirms export outlook (Rewrites throughout with U.S. market open, adds quote, updates prices, changes byline, dateline, previous PARIS/SINGAPORE)
CHICAGO, Jan 14 (Reuters) - U.S. soybean futures fell to a 1-1/2-week low on Monday on technical selling and on concerns about demand from China as the world's top soy importer remains locked in a tariff war with the United States.
Wheat also fell after Russia, the world's top supplier, left its export forecast unchanged despite recent speculation that supplies are dwindling.
Corn drifted lower, following soy and wheat.
Grain markets languished as Chinese trade figures dampened demand sentiment and fueled concerns across financial markets about an economic slowdown in China and beyond.
China's General Administration of Customs said December soy imports in December fell 40 percent from the same month a year earlier, the lowest for the month since December 2011.
Future Chinese demand for animal feed imports also remained a concern due to the spread of African swine fever, which has prompted culling of the hog herd and pressured Chinese soymeal prices.
"The market doesn't like the African swine fever and it likes even less the Chinese trade numbers," said Mike Zuzolo, president of Global Commodity Analytics.
Losses in grain futures were limited, however, by concerns about adverse growing weather for corn and soybeans in South America, as well as continuing hopes of fresh Chinese purchases during a 90-day truce for negotiations.
U.S. officials expect China's top trade negotiator to visit Washington this month, signaling higher-level discussions are likely to follow last week's talks in Beijing.
Chicago Board of Trade March soybeans fell 8-1/2 cents to $9.01-3/4 a bushel by 11:52 a.m. CST (1752 GMT) after breaching chart support at several key moving averages.
March corn was 1-1/4 cents lower at $3.77 a bushel.
CBOT March wheat shed 5-1/2 cents to $5.14 a bushel, dropping below its 20- and 50-day moving averages.
Easing concerns about harsh cold in the U.S. Plains wheat belt weighed on prices as farm fields in a large portion of the region received several inches of snow over the weekend. The snow cover should protect dormant crops as severely cold weather hits the region this week.
Expectations that dwindling supplies in Russia would create export demand for U.S. wheat had helped to push Chicago prices higher on Friday. But export hopes were tempered on Monday by confirmation of the Russian agriculture ministry's outlook for 2018/19 grain shipments. (Additional reporting by Gus Trompiz in Paris and Naveen Thukral in Singapore Editing by David Goodman and James Dalgleish)