Russia Retains the Southern Coast of the Caspian

Not all maps of "The Expansion of Russia" show areas which Russia only temporarily held. This one does, however,

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and what intrigues me most about it is the southern coast of the Caspian Sea, which Russia held from 1723 to 1732. For historical background, see https://en.wikipedia.org/wiki/Russo-Persian_War_(1722–1723) and https://en.wikipedia.org/wiki/Treaty_of_Resht ("The Treaty of Resht was signed between the Russian Empire and Safavid Empire at Rasht on 21 January 1732. According to this treaty Russia waived its claim to any territory south of the Kura River. This included return of the provinces of Gilan, Mazandaran, and Astrabad, conquered by Peter I in the early 1720s. The Iranian cities of Derbent, Tarki, Ganja, etc. north of the Kura river would be returned three years later.[1] In return, the Persians, now de facto ruled by the militarily successful Nader Shah granted trade privileges to the Russian merchants and promised to restore the Georgian king Vakhtang VI, then residing in exile in Russia, on the throne of Kartli as soon as the Ottoman troops could be expelled from that country. The provisions were confirmed by the 1735 Treaty of Ganja,[2][3] according which treaty all the regions north of the Kura river were returned as well.[4]")

Can anyone see a plausible scenario in which Russia retains control of the southern coast of the Caspian after 1732, and eventually (after the conquest of Transcaspia) makes the entire Caspian a "Russian lake"?
 
Can anyone see a plausible scenario in which Russia retains control of the southern coast of the Caspian after 1732, and eventually (after the conquest of Transcaspia) makes the entire Caspian a "Russian lake"?
Nader doesn't prove to be the Napoleon of the Middle East, the Safavids are dead and the Hotak are a tad far from their power base in Afghanistan.
 
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