> "are assessed by the Pentagon yesterday to not originate in the US or any other nation"

This statement logically means that:

* The Pentagon assessed (determined) that X is true

* Where X is defined as "The drones do not originate in the US or any other nation"

That is different than the statement:

* The Pentagon has stated that (a) X is false, and (b) they have no evidence that Y is true.

* Where X is defined as "The drones are US military assets"

* Where Y is defined as "The drones originate from and/or are assets of a foreign nation or adversary."