@xixiangdong Yes and No. I see two candidates for the forth kingdom and both options exclude one another I think. Rome ruled the world when Christ was on the earth (iron thigh). At some point, it split into 2 parts (legs). And in the mixture of iron/clay toes you could see the different EU-states. But neither the EU nor Papacy rules the world. The other candidate is the one actually ruling. Problem there is: They definetly didn't rule at Christ's time. So, I don't have a clear view on this.

@xixiangdong One more thought on the Kingdom of Christ: It is not a worldly kingdom (Christs own words). It is a spiritual kingdom in which he rules within His Saints wherever they are on earth. So in fact I do see Daniel 7 being fulfilled since ~33AD in a spiritual way. Of course this view excludes a 1000year-reign of Christ on earth.

@xixiangdong I'm not far from the reformed, amilennial position on eschatology. The Kingdom is spiritual and eternal, the Last Days and Tribulation started with Christs ascension and will last until His Second Coming.
I will probably have difficulties arguing for my position if we dig deeper, but it made more sense to me than classical premillenial-dispensationalism which I was taught for many years.