A Kaspersky Plus for PC and iOS question

[Gniblett]

My licence for Kaspersky Internet Security is expiring at the end of the month and am planning to move to Kaspersky Plus as KIS now appears to be a legacy product. If I buy the licence to cover 3 devices, I assume this will include my iPhone and iPad running the Kaspersky Security & VPN for iOS (iPhone and iPad)

As I believe Apple Apps are sandboxed I wonder whether this means I would need to have the VPN turned ON all the time for Kaspersky Security & VPN to actually work?

Is this the case, or are the other aspects of the App able to function without the VPN being active?