Probably not. Jesus has not given to any of his children a blank check for them to fill in for whatever they wish.
Do you remember the foolish request of the sons of Zebedee?
Then James and John, the sons of Zebedee, came to him. “Teacher,”
they said, “we want you to do for us whatever we ask.”
“What do you want me to do for you?” he asked.
They replied, “Let one of us sit at your right and the other at
your left in your glory.”
“You don’t know what you are asking,” Jesus said (Mark 10:35-38a NIV).
Jesus's words should resonate in all believers' hearts when they are tempted to fill in a blank check from God. Often we do not know what we are asking!
Moreover, the stipulation that Jesus included in his words to Philip was that Philip (and all believers) should "ask in . . . [Jesus's] name."
That does not mean that as long as believers append "in Jesus' name" to their prayers, Jesus is somehow obligated to grant their requests. To ask in Jesus' name is to ask for him and his Father to be glorified, and they are glorified when believers' requests are in accord with Jesus's purpose in coming to earth; namely, to become the Savior of the world.
Jesus's name, Yeshua in Hebrew, means God is salvation. Therefore, believers' prayer requests need to be in accord with God's salvific work which He accomplished through His one and only Son.
Could the prayer of a believer for God to snuff out the life of a dictator be in accord with God's will, which in essence is for God's salvific work in the world to be enhanced and furthered? Perhaps, but not likely.
Christians who live under the tyranny of a dictator deserve our prayers and practical support. God, however, has the ability to enhance and expand His salvific work in the world when His church experiences persecution, which is often the case in dictatorships and oppressive regimes.
The argument could be made that the church in China would not have experienced its miraculous growth in recent decades had it not been for communist ideology and the godless philosophy of Chairman Mao and his followers.
Very oten God's thoughts and ways are not our thoughts and ways. They are above and beyond us. The prophet Isaiah knew this truth clearly:
“As the heavens are higher than the earth,
so are . . . [God's] ways higher than your ways
and my thoughts than your thoughts" (55:9 NIV).
Perhaps a better and more biblical prayer request would be that God's church would grow and expand in spite of governmental oppression and dictatorship.