Why does it always lead back to Russia?

Here’s the Trump family in 2007 ‘visiting’ Russia.

From L-R are:

#Elena Baronoff [Trump Org, FL (d)]
#Ivanka
#Michael Dezer [CEO Dezer Corp, Trump Org, FL]
#Mikhael Babel [was Russian real estate exec; tied to Russian oligarchs (d)]
#Eric
#DonJr