NEW : Will radar-rattling turn to conflict ? A group of boats carrying Japanese nationalists has since left the area . The number of Chinese ships near the disputed islands is the largest yet , Japan says . China claims most of the South China Sea and its neighbors Brunei, Malaysia, Taiwan and Vietnam have rival claims. Nearly 170 Japanese lawmakers visit a controversial war memorial .
NEW : A group of boats carrying Japanese nationalists has since left the area . The number of Chinese ships near the disputed islands is the largest yet , Japan says . China claims most of the South China Sea and its neighbors Brunei, Malaysia, Taiwan and Vietnam have rival claims. Nearly 170 Japanese lawmakers visit a controversial war memorial .