A new radar and missile would also have to be developed for the project.
Several of those components would also require new, advanced radars on the ground or at sea, and sensors in space.
The new radar has longer range coverage (up to 150 km) and able to guide a greater variety of weapons systems.
It had a new radar which would have provided a resolution of 5 to 7 meters.
The new radar would also require more controllers to monitor the close approaches during bad weather.
Ground was broken for the new radar in April 1998.
The new radar was constructed next to the stage A radar.
He said the problems were not insurmountable and added that the new radar would begin operating next year instead of this month.
The class introduced high pressure steam turbines and new radars into Soviet service.
The first face of the new radar was announced as undergoing testing in March 2012.