iOS VPN kill switch or force VPN

I'm interesting to use network (and internet too) access on iPhone only through pre-configured (by corporate profile) VPN connection. If the VPN connection is unavailable for some reason then network must to be unaccessable. Which ways I have to solve my problem? I need to use some 3rd party software or it can be solved by MDM Profile?

Best regards, Grigoriy.

iOS VPN kill switch or force VPN
 
 
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