With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Security problems in the Andaman Sea are not new , but they have deteriorated during the past few years , in tandem with a deterioration in the security situation in Bangladesh , Nepal and Bhutan , and particularly in the northeastern Indian states of Manipur , Nagaland and Tripura .
text_B: The deteriorating did not happen
not-entailed.