To spite a mother
Toshiba may become not a very fortunate ally for Russian nuclear scientists, but surely will become their bitter enemy. Westinghouse controlled by Japanese is slow and sure regrouping its powers in East Europe, preparing for driving out Russian TVEL from that business. And in Kazakhstan Japanese-American alliance is trying to stop uranium export to Russia and to redirect uranium resources of the Republic to servicing the needs of Westinghouse.
Allegedly, Atomenergoexport could propose Japanese corporation its services in the sphere of a nuclear fuel cycle. There is some point in that. But the problem is that Japan will be a full member of the American GNEP initiative, within this initiative some dangerous tendencies for the Russian nuclear fuel cycle are taking shapes.
Perhaps, the only argument for the cooperation with Toshiba might be a desire to exert pressure upon the Unite States, which, you know, have stopped a signing procedure of 123 treaty with Russia. Washington may become more compliant indeed if realizes, that Moscow is capable of managing without Russian-American nuclear friendship.