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No. It's like asking if you can play any Online game Offline.
It doesn't work like that.
True, once you have logged in & started a solo mission you are playing "offline", but you will have a big red warning message & unless you reconnect before finishing the mission (or during the victory screen), any progress you might make is lost. The game needs to sync with the servers at login & before/after every single mission.
Unstable internet = solo mode might work, if you are lucky.
No internet = you cannot play, end of story.
but playing without an internet connection is not possible