The Sovereign-class was introduced during the early 2370s, and is the most advanced starship design in the fleet, though not as large as the Galaxy class starship. Proving to be highly successful against the Borg, the Sovereign is hailed as one of the "best balances of exploration and tactical capability since the Constitution-class of a century prior" and was expected to be Starfleet's leading class well into the 25th century. Sovereign-class starships are quite adaptable to different missions, whether they be scientific, defensive, or diplomatic.