 Complete the following phrase:  In the middle of the 16th century, the Crimean Khanate asserted a claim to be the successor to the Golden Horde, which entailed asserting the right of rule over the Tatar khanates of the Caspian-Volga region, particularly the Kazan Khanate and Astrakhan Khanate. This claim pitted it against Muscovy for domice in the region. A successful campaign by Devlet I Giray upon the Russian capital in 1571 culminated in the burning of Moscow, and he thereby gained the sobriquet, That Alğan seizer of the throne. The following year, however, the Crimean Khanate lost access to the Volga once and for all due to its catastrophic defeat in the 