Differences between "obviate" and "preclude"?

Source: Collins Dictionary

OBVIATE: to anticipate and prevent or eliminate (difficulties, disadvantages, etc.) by effective measures; render unnecessary:

PRECLUDE: to prevent the presence, existence, or occurrence of; make impossible:

EXAMPLES:

OBVIATE: A peaceful solution would obviate the need to send a UN military force.

Obtaining a doctorate, he noted, is perhaps the best way to obviate that time-consuming and sometimes insurmountable problem.

PRECLUDE:

His contract precludes him from discussing his work with anyone outside the company.

The fact that your application was not successful this time does not preclude the possibility of you applying again next time.

In each of these examples, both terms seem to allude to the notion of "actions taken in order to make something impossible from happening"