To my knowledge it is not illegal to sell real estate to Russians or borrow money from foreign banks. As for cash purchases beginning in 2003, one would think in 14 years if something was fishy, like money laundering, it would have been dealt with given those sales were no doubt reported in IRS filings by the Trump organization.
As for contacts with Russian officials, it would depend on who the official was. Carter Page for example was an energy consultant working with Russian energy officials. Perfectly legal! As for Michael Flynn, he wasn't charged with collaborating with Russians. He was charged with one count of lying to FBI agents. Surely you can see the difference.
As for the Trump Tower meeting with the Russian lawyer, it was a setup engineered by Attorney General Loretta Lynch for no other reason than appearances. You see...she, by law, was the only official authorized to sign off on "special immigration parole" status for the Russian lawyer to enter the country, having been denied a visa by the State Department.
That should be enough for you to chew on for now little feller.
Oh one other thing, Syria has been a ally of Russia for many years. Trump didn't hand them over!