In a significant commitment on defence cooperation, Sri Lanka today assured India that it will not permit its territory to be used in any manner inimical to the security of India. Sri Lankan President Anura Kumara Dissanayake reiterated Colombo's stand in the joint statement today, making its promise to New Delhi official. Colombo's assurance to New Delhi comes at a time when China is aggressively pursuing its 'Mission Indian Ocean' - which targets India.