The invading Mongols accelerated the fragmentation of the Rus'. In 1223, the disunited southern princes faced a Mongol raiding party at the Kalka River and were soundly defeated.  In 1237–1238 the Mongols burnt down the city of Vladimir (4 February 1238)  and other major cities of northeast Russia, routed the Russians at the Sit' River ,  and then moved west into Poland and Hungary . By then they had conquered most of the Russian principalities.  Only the Novgorod Republic escaped occupation and continued to flourish in the orbit of the Hanseatic League . 
What is also exceptional about the Trump case, distinguishing it from other forms of national electioneering, is the absence of any question about intent, or state of mind. In the most recent round of revisions to its rules, the FEC went to some lengths to allow a candidate or political committee to establish that it did not reasonably know about the foreign source of the contribution or expenditure or other value received. (11 . § (a)(4),(7) ). This is no help to the Trump campaign which certainly had every reason to know that, as widely reported and declared officially by the US government, Russia was behind the hacking. Trump, on the campaign trail, said as much in inviting Russia to release more. At other times he suggested that perhaps Russia was not behind these activities, that no one could know: but, remarkably, he allowed for the possibility that another foreign power, China, might have been responsible. And once again, there are other parts of the public record bearing on intent that will receive close investigative scrutiny, like Trump’s close confidante Roger Stone’s repeated statements about his communications with Wikileaks and Julian Assange.