The Muscovite Empire in 2140(1387)
Menguren Empire's raids, demands of tribute, and city razings were designed to keep the principalities isolated from the rest of Europe, in order to keep them backward and stagnant. This was less effective than OTL with Rome's constancy and proximity, although if Moskva and Novgorod had been in possession of a more centralised and institutionalised technological tradition, and if they had somehow managed to hold against the Horde's armies even moderately, the Menguren Wars could have served as a stimulant towards modernisation in northeastern Europe. Ideas and strong princes were able to rise despite the Horde's terror.
By the early to mid 21st century (1250-90) Novgorod had given up much of its control of the Baltics, including its sale of Island Hiiu to the Romans, in order to more effectively protect its own borders and pay its debts. This period led to the greater co-operation between Novgorod and Muscovy in a common (but still inadequate) defence.
In 2054(1301) With the increasing tension and discrepancy between the Muscovite and Novgorod nations’ rich and poor, along with the Medius Ordeum continuing its attacks for power, Andrus Alexandrovich III, a Muscovite prince, rallied support and a massive army with the promise of defeating the Menguren horde as a way to put poor people’s problems further back in their minds. Allying with the like-minded Novgorod general Sergei (Sergus) Prokoveil, Alexandrovich began campaigns into the Menguren nation.
Early the next year, although totally defeating several armies of the Medius Ordeum, Alexandrovich and Prokoveil's armies were decimated when they reached Saraj the capital (which had been moved to the new, better protected location just recently-the redirection of Andrus Alexandrovich’s army to the new capital took time, money, and lives). Although the armies were defeated, the Menguren confidence in their control of the Slavs was weakened greatly whilst the Muscovite and Novgorod Masaiadas declared them to be great martyrs- Alexandrovich in particular becoming a legendary hero. In their memory, the huts and broken walls that were then Kiev were rebuilt in late 2055(1302) and renamed Alexandrogrod (not to be confused with Alexandrogrod, the current Rossjan Union's capital), while the city of Prokoberg was built in early 2056(1303) with close proximity to OTL St. Petersburg.
As the Horde's confidence in their control over the Rossjans continued to fail, Auly Danilvich, later called the Great, gathered another massive army with which he spent a great deal of both Muscovy and Novgorod's treasuries to modernise to standards that would have rivaled Rome's 100 years earlier. Such improvements included the first Rossjan-made medvyedkataats (tanks); they were also the first to use sloped armour. During 2065(1312) Auly the Great achieved decisive victories, convincing the lords of Muscovy to grant him the first title of Czar. It really was thus then that Auly the Great created the Muscovite Empire.
Unfortunately, to continue to pay for the armies and constructions of Auly, (and as his conquests weren't exactly loot grabs), he greatly increased the stranglehold of lords over their slaves in order to keep things running; further straining civil tension.
By 2076(1323) Auly the Great and his Novgorod allies had conquered the entirety of the Medius Ordeum. They then made plans for extensive eastern expansions, starting with the Volga Vepsians (invading the Djagatai was not high on their list). They were still not friendly with Rome but after campaigns into the Caucus and Bosporos Provinces in late 2078(1325), the Muscovites were convinced that Rome was not an empire to backhand too often. It was also at this time that the Muscovites began subjugating Novgorod very subtly. Muscovy's empire building was at its greatest speed at this time.
Over the next 50 years, Muscovy's Czars continued to encourage technological and cultural development in order to contend with Rome and the world, although this fear of Rome was emphasized by the Czars to amass ever growing autocratic powers over both masaiada and state. Slavery was also so strictly enforced that large groups of slaves chose to escape and risk a grotesque death rather than continue to live such exhausting and weary lives. Roman slaves were true freemen in comparison. These escaped/wandering slaves, known as Pegnadts also formed a civil stress of their own, though many were convinced to help colonise and protect the empire's far eastern boundaries.
In the interests of reaching out and forming military alliances at least for defence, in 2084(1331) the Czar Stanislav Danilvich made a secret alliance with Dai Ön Yeke Sinica regarding the sharing of a Sibirian border and defiance against the Concilium Mundi. This military and limited economic agreement first formally introduced eastern culture into the Muscovite Empire, and the Czars encouraged it as a way to distinguish themselves from Rome and the other Europeans. This alliance would also aide Muscovy in its quest for modernisation. The alliance would prove to be a foot in the door for them getting in on the Pan Asian Bloc.
Since Kiev's initial collapse in the 1800's, most of the Muscovite’s land was empty while the Feudal Republic of Novgorod always had nearly twice as high a population (~100 million). The Republic was dependent on Muscovite crops to feed its citizens, a situation purposely instigated by Muscovy. In the name of helping the PABloc’s strength, the Czar Dmitri Ivanovich Dinskoi annexed Novgorod in 2131 (1378).