* Nikkei up 0.99 pct, Topix gains 0.62 pct
* Technology shares lifted by rise in U.S. peers
* Reduced Sino-U.S. trade war concerns lift China-linked shares
By Shinichi Saoshiro
TOKYO, Dec 13 (Reuters) - Japanese shares touched a one-week high on Thursday with sentiment lifted by signs of reduced Sino-U.S. trade tensions, and technology firms got a boost from a rally for U.S. peers.
The benchmark Nikkei share average .N225 ended the day up 0.99 percent at 21,816.19. During the session, it reached 21,871.34, its highest since Dec. 5.
Global equities slumped at the start of this week on continuing concerns over Sino-U.S. trade relations. But investors have slowly stepped back into riskier assets in the past couple of days on hopeful signs of progress in talks between the world's two biggest economies.
Chinese state-owned companies have bought more than 1.5 million tonnes of U.S. soybeans, Reuters reported Wednesday, in the first major U.S. soybean purchases in more than six months - the latest sign of easing tension between the two sides. has been a volatile week for the Nikkei, which fell 2.12 percent on Monday but climbed 2.15 percent on Wednesday.
"The Nikkei is up, but the market is now awaiting a fresh round of incentives to test further highs," said Takashi Hiroki, chief strategist at Monex Securities. "Sellers are locking in profits, limiting the market's rise."
He also said developments in trade conflicts "can be seen as an opportunity as they provide the market with incentives".
Shares of technology-related companies advanced after the S&P technology sector .SPLRCT , which is heavily exposed to China trade, gained overnight.
Panasonic Corp 6752.T rose 1.5 percent, Rohm Co 6963.T gained 2.2 percent and Canon Inc 7751.T 1.1 percent.
Companies that derive a large portion of their sales in China also advanced. Industrial machinery maker Komatsu Ltd 6301.T added 2.4 percent, robot manufacturer Fanuc Ltd 6954.T 1.4 percent and cosmetics company Shiseido Co 4911.T advanced 1.1 percent.
Takeda Pharmaceutical Co 4502.T surged 7 percent after a ratings upgrade by Tokai Tokyo Research Institute.
Hitachi 6501.T slipped 0.5 percent after the Nikkei business daily reported it was nearing a deal costing between 600 billion to 800 billion yen ($5.29 billion to $7 billion) to buy a power grid business from Swiss engineering group ABB ABBN.S . decliners included entertainment facilities operator Tokyo Dome Corp 9681.T , which sank 4.3 percent after reporting net profit fell 17.7 percent to 6 billion yen ($52.9 million) in the nine months through October. 33 subsectors of the Tokyo Stock Exchange (TSE) 29 gained, led by iron and steel .ISTEL.T , metal products .ISTEL.T and sea transport .ISHIP.T .
The broader Topix .TOPX ended the day up 0.62 percent at 1,616.65. ($1 = 113.4500 yen)