Sony removed Helldivers 2 from sale in countries where PSN is not available. For example whole CIS region.
(programming.dev)
Here are a few discord comments about the situation from the Helldivers 2 discord:
did you happen to miss when they made the original content and the first couple dlc's unavailable to play and refused to give refunds for it? Bungie can fucking die in a hole and destiny 2 has been a trash fire for years already