Segolene Royal disapproves of horizontal proliferation and approves of vertical proliferation

Vertical proliferation, however, remains a challenge.

France’s "vertical proliferation" thus serves to encourage the "horizontal proliferation" of these weapons of mass destruction.

it remains dependant o­n the vertical proliferation by the need for maintaining, to improve the network.

The extensive programmes to modernise nuclear weapons constitute “vertical proliferation” and flout the requirements of “good faith”.