* Nikkei 225 Stock Average: +251.01 (+1.4%) to 18,235.15 * Nikkei 225 futures Osaka: +290 (+1.6%) to 18,270; Singapore (SGX) 18,270, Chicago (CME) 7/12 — 18,195 * TOPIX: +20.62 (+1.2%) to 1,783.68; Advancers 1,029 x decliners 558 (unchanged 144), New highs 45 x new lows 37 * Jasdaq: +0.29 (+0.3%) to 81.24 * Yen weakens [...]