NEW : A fleet of boats carrying Japanese troops has since left the area . The number of Chinese ships near the disputed islands is the largest yet , it says . The ` ` potential for escalation has increased , '' a recent analysis says . Nearly 170 Japanese lawmakers dedicated 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 . The `` potential for escalation has increased , '' a recent analysis says . Nearly 170 Japanese lawmakers visit a controversial war memorial .