The Norwigians have not agreed to buy it.
They, like the UK have signed an MoU. This is not binding to the degree that they will buy it.
Signing the MoU is not a commitment to purchase the JSF, Norway says, and it will maintain competition between the F-35, Eurofighter Typhoon and Saab Gripen until making a decision in 2008.
Seems a way to secure jobs. Risky though.
Kongsberg has signed long-term framework agreements to produce leading edges, fuselage components and other composite parts for the F-35, conditional on Norway buying the F-35, and on the Oslo government giving the company a guarantee to cover the risk of building a new composites plant.
See
Flight International article 30/01/07