What do we see here?
As you said: The painting is about the Blockade of Venezuela (1902-1903).
The German Kaiser AND Italy AND England tried to force Venezuela to pay its debts back, after Castro said they couldn't and wouldn't.
Further we see Trump with a CATHOLIC priest.
Trump is holding a CHILDREN'S book.
The author is Francis Mann.
Like the man (Pope) Francis.
The title is "The Wounded Butterfly".
Makes one think about abused children.
Trump sees Venezuela as the US's backyard.
All the European Royals are sort of Rome's/ the Vatican's CEOs.
Rome couldn't manage Europe on its own.
Therefore the papacy croned the royals in order to do it for the papacy.
The Vatican still sees South America as their own possession.
Imo, Trump is threatening Francis to back off, by reminding him of how it went, when Germany, Italy and England tried to blockade Venezuela in 1902.