A senior Russian space industry source told Sputnik that Moscow will develop an ugraded Soyuz version at its own expense, and no funding from NASA is expected.
"NASA will not pay, it is planned to carry out all the work at own expense," the source said.
To ensure the capability of the Soyuz spacecraft to fly to the Moon, an accelerating unit and a new thermal protection that will allow the ship to return to the Earth’s atmosphere at the second cosmic velocity (11.2 kilometers per second, or 6.95 miles per second) are needed.
The lunar version of Soyuz will also require new power supply, communications and life support systems.
Documents of Russian spacecraft manufacturer RSC Energia available to Sputnik show that installation of star sensors, manual control devices, an evaporative system, additional engines and oxygen cylinders are necessary to ensure the spacecraft's flights to the Moon.
In late June, Rogozin said that manned flights to the Moon on the Soyuz spacecraft are possible, while the development of the new Federation spacecraft is being completed. The development of a new spacecraft designed specifically for flights to the Moon has been underway since 2009.
In addition, he said that Roscosmos was expecting new negotiating positions with NASA on the near-Moon station in connection with the start of the upgrade of the Soyuz spacecraft for flights to the Moon.
NASA did not respond to Sputnik's question whether it really turned to Russia with a proposal to create a backup manned space system. Roscosmos also could not quickly respond to Sputnik's request about the sources of the project's funding.