The year 2018 marks the 20th anniversary of the last nuclear tests conducted by India and Pakistan. Since 1998, both nation states have pursued their nuclear ambitions via the use of new ballistic missiles, cruise missiles and sea-based nuclear delivery systems. Events in the last five years have put emphasis on nuclear weapons technology, research and development, as well as production and testing. This evolution has taken place in a context of deteriorating bilateral and regional relations: the tense situation across the line of control (LoC); China’s support for Pakistan’s missile programme; the one-month stand-off between Indian and Chinese military forces; India’s test of the Agni-V ICBM; Pakistan’s testing of the nuclear capable Ababeel missile with a multiple warhead (MIRV) payload; and India’s surgical strike response to attacks attributed to Pakistani terrorists. These developments underscore the growing nuclear complexity in South Asia, the increasing investments in nuclear capabilities, and a dangerous nuclear arms race in the region.