Can I use stop/keep/deter even if the action is already happening?
For example, if a guy is helping terrorists currently, can I say "we need to stop/keep/deter him from helping terrorists"?
I checked dictionaries but I am not sure if the verbs can be used when the action is already happening.
I asked this question, about Prevent: Usage of a verb, Prevent
And I got a comment that prevent cannot be used if the action is happening. But according to dictionaries, prevent means stop, so I am confusing if I can use stop in the above situation. And as far as I know, stop, deter and keep mean the same, so I would like to ask those three verbs can be used even though the action is already happening.