There is no bear mentioned in the book of Revelation.
Maybe you are referring to Daniel chapter 7? If so, it is generally understood that the second of four beasts is the one that followed the Babylonian Empire, which would be the Medo-Persian Empire.
The Antichrist’s empire is a conglomeration of those beasts, and you’ll notice that his beast has the feet of a bear. We have swapped symbols around since then for example, the Romans used the eagle and so now United States is the eagle. Etc..
I’m saying these things are cyclical