Fair and equitable treatment/Minimum standard of treatment, including denial of justice claims
Full protection and security, or similar
Umbrella clause
https://www.iareporter.com/articles/looking-back-in-genin-v-estonia-arbitrators-found-that-revocation-of-banking-license-did-not-violate-investment-treaty-taking-into-account-context-of-post-communist-economic-transition/ (requires subscription)