TOKYO, Nov 25 (Reuters) - Japan's Nikkei share average opened 0.9 percent higher on Thursday as recent strength in the dollar against the yen and gains on Wall Street prompted short-covering following the previous day's loss.
But investors were wary about chasing Japanese shares too aggressively on rallies due to concerns over tensions on the Korean peninsula and worries about debt problems in Ireland and other European countries, traders said.
The benchmark Nikkei opened up 87.74 points at 10,117.85, while the broader Topix index advanced 0.8 percent to 873.34. (Reporting by Chikafumi Hodo; Editing by Edmund Klamann)