The Moscow-installed military administration ruling the area around the occupied Ukrainian city of Kherson said it is preparing to hold a referendum on joining Russia.
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Stremoussov said Kherson should become "a full-fledged member" of Russia.
Russian-installed officials said earlier that their security forces had detained Kherson Mayor Ihor Kolykhayev on June 28 after he refused to follow Moscow's orders. A local official said the mayor was kidnapped.
Kherson, an important port on the Black Sea, has been fully under Russian control since early March, just weeks after Moscow launched its unprovoked invasion of Ukraine.