Anyone who has studied Donald Trump would know that there are two very important, critical even, elements Mr. Trump would die for a) something which elevates (or helps to elevate) him; he likes to be noticed; he likes to be the center of attention b) something which brings him money, plenty of it.
Before Mr. Trump took the road to run for public office, he solicited and obtained a great deal of investment and funding from Russian investors. It was not by accident or due to business expansion that Donald entered into business partnership with Russia. It was out of necessity; after decades of US banks financing his failed business initiatives (Mr. Trump filed for bankruptcy six times), the financing wells in the US dried up. Interestingly, the Saudis being very business savvy, kept Mr. Trump at arm’s length. And Since Europe also paid a price through US financing affiliations for Mr. Trump’s pronounced mismanagement, it kept its distance as well. So, Mr. Trump turned to the only place that would not discriminate against bad management, Russia.