The short answer is that the Malchut Harisha in our times is the Roman Curia which commands the hearts and minds of over 1.38 billion around the world mostly in territory that was captured by the original Roman Empire and successive states that splintered off. The Roman Curia is ruled by the person of the Pope and upon his death almost all members resign.
The clerical takeover of the Roman Empire began with the Edict of Milan which legalized Christianity in the Roman Empire. Later the Edict of Thessalonica would make Christianity the official state religion.
Then Emperor Justinian formed Pentarchy of five Patriarchs with 5 jurisdictions: Rome, Constantinople, Antioch, Jerusalem and Alexandria.
The Pope received the Donation of Pepin thus marking the beginning of the Papal States and the temporal power of the Pope. The Holy Roman Empire was formed when the Pope crowned Charlemagne as Roman Emperor. From here on in the Pope would be kingmaker in Western Europe.
The Bishop of Rome always felt he was a cut above his peers and kept asserting Papal supremacy. This eventually lead to the East-West Schism. The Roman Curia was formed in response to this schism. If anybody still doubts the Papal aspirations to dominate the Roman Empire perhaps they should read the history of the Donation of Constantine.
A major challenge to the Pope’s undisputed power came with the Reformation. This prompted the Roman Curia to spring into action with the Counter-Reformation. From the time of the Council of Trent the main instrument of the Roman Curia of imposing its will on the world, the Secretariat of State was highly developed.
The Pope briefly lost temporal power as a result of the Unification of Italy. However, later the Roman Curia was able to force the Fascist dictator Benito Mussolini into signing the Lateran treaty which gave the Roman Curia the legal framework to establish diplomatic networks and pursue their foreign policy objectives.
It didn’t take long for the Roman Curia to act as kingmaker installing Adolf Hitler as the Nazi dictator of Germany in exchange for the signing of the Reichskonkordat. This is well documented in John Cornwell’s book Hitler’s Pope.
Chazal make it clear that the only power that can challenge Rome and have a chance of beating them is Persia.
Rebbi predicts a Persian victory over Rome.
Reb Yehudah also predicts a Persian victory.
Reb Yehudah’s view that Persia should win makes sense as it is based on the merit that Persia built the Second Temple in stark contrast to Rome that destroyed it.
The dissenting view of Rav is that Rome will win as Rome must spread throughout the world for 9 months before the son of David arrives.
As soon as you hear 9 months you should get very worried. The 9 months are a period called chevlei Moshiach and spell 9 months of unspeakable tragedy for the Jewish people.
I therefore advocate e Persian victory as per the opinion of Rebbi and Reb Yehudah.
Edit
As requested I provide a Jewish source to back the logical inference of the undisputed history I have here summarized.
Also how is it possible that all the nations of the world will rise up
wihtout a reason to fight against Edom and what is this envoy that was
sent and who sent it? Rather the true meaning is waht I said two times
that the nation of Edom is the summation of the Christians that begin
with the Romans will be awoken to go up and conquer Jerusalem because
it is holy for their religion and Jesu is buried there as well and
just like they have many times been stirred to conqured for any given
reason.
Abarbanel on Ovadiah