I used to love that story (about Pepsi's navy), but it actually doesn't seem to be true, unfortunately. There was a deal in place, but it never happened thanks to the 1991 breakup of the USSR. And even if it had, the small number of ships involved wouldn't even be close to the 6th largest fleet.
https://melmagazine.com/en-us/story/did-pepsi-have-one-of-th...
https://www.warhistoryonline.com/instant-articles/pepsi-once...
But if you're running a huge consumer-brand corporation in the social media age, with the great majority of your sales in places where Russia's recent actions are very unpopular, then "could we legally continue...?" is not basis for your decision.