 Complete the following phrase:  The post-Imperial nature of Russian subdivision of government changed towards a generally autonomous model which began with the establishment of the USSR of which Russia was governed as part. It was liberalized in the aftermath of the Soviet Union, with the reforms under Boris Yeltsin preserving much of the Soviet structure while applying increasingly liberal reforms to the goverce of the constituent republics and subjects while also coming into conflict with Chechen secessionist rebels during the 