From President Trump’s standpoint, a decline in the World Cup’s popularity due to Ronaldo’s absence would not be pleasant, and the same would be true for FIFA's.
For a nation founded on massacres of Native Americans and centuries-long African slave ownership, the lurch towards racism under Trump is not surprising.
If Trump were to implement his threat, he would, in essence, be Vladimir Putin's partner in crime in a war of aggression that violates international law.
While China has warned of serious consequences and may impose sanctions, the U.S. frames the sale as a necessary sustainment measure for existing aircraft rather than an escalation.