Japan's Sumitomo Mitsui Financial Group (SMFG) <8316.T> and Sumitomo Corp <8053.T> on Tuesday said they would buy Royal Bank of Scotland's aircraft-leasing business, whose assets are valued at $7.2 billion (4.6 billion pounds).

SMFG will take around 70 percent of RBS Aviation Capital, while Sumitomo will hold the rest. They did not announce the cost of the acquisition.

(Reporting by Mayumi Negishi; Editing by Joseph Radford)