sentences:  Later, Mikhail's son Aleksey (r. 1645-1676) relied on a boyar, Boris Morozov, to run his government.Morozov abused his position by exploiting the populace, and in 1648 Aleksey dismissed him in the wake of the Salt Riot in Moscow.After an unsuccessful attempt to regain Smolensk from Poland in 1632, Russia made peace with Poland in 1634.