China has summoned the Japanese ambassador in Beijing and demanded that Prime Minister Sanae Takaichi retract her recent remarks on Japan's potential involvement in a Taiwan emergency, the Chinese Foreign Ministry said Friday.Calling Takaichi's remarks "extremely wrong and dangerous," Chinese Vice Foreign Minister Sun Weidong warned in his meeting with envoy Kenji Kanasugi that "anyone who dares to interfere in China's reunification cause in any form will surely be dealt a heavy blow," the ministry said.The two Asian neighbors have been embroiled in an escalating war of words since the remarks by Takaichi, a China hawk known for her pro-Taiwan stance.Sun was also quoted as saying the Japanese leader's "provocative" remarks which implied "the possibility of armed intervention in the Taiwan…