In a bid to strengthen Indo-Sri Lankan defence cooperation, warships and navy personnel of the two countries have begun a joint sea exercise off the western coast, to train Lankan cadets on-board Indian warships."As many as 95 Sri Lankan officers under Trainees and 141 Indian officers under Trainees, cadets and midshipman participated in the exercises," Sri Lankan Navy spokesperson Commander D K P Dasanayake said. The exercises and training would continue till Thursday.