In the text:

"They are exhausted families, sheltering in subway stations and schools: Ukrainians displaced by war face a difficult journey west."

isn't teher a preposition missing between journey and west? something like:

"journey TO west"

  or

  "journey IN THE west"???

I mean if the reader is not very aware of the context it might be confusing. Is that grammatical leave out the preposition there?

“They are exhausted families, sheltering in subway stations and schools: Ukrainians displaced by war face a difficult journey west."

Isn’t there a preposition missing between “journey” and “west”? Something like "journey TO west" or "journey IN THE west"??

I mean, if the reader is not very aware of the context, it might be confusing. Is it grammatical to leave out the preposition there?