These developments unfortunately put an end to the prospect for keeping South Asia free of nuclear weapons - an objective which Pakistan had actively pursued, he said, hinting at India.
India conducted a series of five nuclear bomb test explosions at Pokhran in May, 1998, which was soon followed by Pakistan's tests.
The spokesman said that despite the nuclear testing, Pakistan remained steadfast in its commitment to non-proliferation and global peace and strategic stability and demonstrated utmost restraint and responsibility in the stewardship of its nuclear capability since 1998.
It is committed to the principle of credible minimum deterrence and has persistently sought deterrence stability in the region, he said.
Mr Faisal also said that this objective has driven Pakistan to offer and conclude several confidence building measures (CBMs) in the nuclear and conventional domains, including the 2004 Pakistan-India Joint Statement which recognised the respective nuclear capabilities of the two countries as a factor for stability.
He said that as one of the most affected countries due to the impact of climate change, Pakistan plans to increase its nuclear power generation capacity to 40,000 MW by 2050, as a clean and cost-effective alternative to fossil fuel.
Pakistan has consistently signaled its willingness to consider further measures for risk reduction and avoidance of arms race in the region, according to the spokesman.
The nuclearisation of the Indian Ocean and canisterisation of ballistic missiles in our neighbourhood should be a matter of concern for the international community as well, since these developments have extra-regional ramifications, he said.
He said Pakistan while recognising its responsibilities, had developed over the years a robust command and control system led by the National Command Authority, and effective nuclear safety and security regimes and export controls.
He said Pakistan looked forward to expanding the scope of its international collaboration in nuclear power generation for meeting the legitimate socio-economic development needs of its people.
As a country with advanced nuclear technology, Pakistan seeks to play its role as a mainstream partner in the global non-proliferation regime, he said.
He said Pakistan had expressed desire to join the multilateral export control regimes and already applied for participation in the Nuclear Suppliers Group (NSG) based on non-discriminatory criteria applicable in a fair manner to all non-NPT states.