Of course, when the thousand years are finished, Satan is released from his prison. Then it becomes very clear that the final and most terrible persecution, by means of which antichrist forces are going to oppress the church. I believe it is clear we are presently in the tribulation period, we have been since Jesus came. When satan is released, then it will get much worse.
For those who do not believe we are in the tribulation period, go to China and tell that to the Chinese Christians. Tell them we are not, as they are murdered for being a Christian, there are martyrs probably daily, whole families are murdered for their faith.
Tell that to the Apostles.
And the millions and millions of Christians who have been martyred for their faith since Christ.