Visakhapatnam, July 10 -- Union Defence Minister Rajnath Singh on Friday urged Indian Navy personnel to prepare for evolving security challenges by mastering emerging technologies, saying the nature of warfare is changing rapidly and future threats are likely to become more complex.

Addressing Indian Navy personnel at the Badakhana in the Eastern Naval Command headquarters in Visakhapatnam, Singh said, "I want to tell you one thing very clearly: The times ahead are not easy. The challenges we face today in the defence sector are going to increase further in the future. Not only is it going to grow, but it is going to become more complex."

He said the nature of warfare was undergoing rapid changes and noted that conflicts could be fought...