I want to know the answer to the following question:
Who was the last ruller to keep the region united?
All the background I'm provided with is that "After his death in 1132 the Kievan Rus' fell into recession and a rapid decline, and Mstislav's successor Yaropolk II of Kiev instead of focussing on the external threat of the Cumans was embroiled in conflicts with the growing power of the Novgorod Republic.". Is that enough to answer the question?
Answer: no