Direct expropriation
Indirect expropriation
https://www.iareporter.com/articles/nicaragua-faces-treaty-claim-brought-by-us-oil-investors/ (requires subscription)
http://globalarbitrationreview.com/article/1152123/oil-investors-bring-icsid-claim-against-nicaragua (requires subscription)
https://www.iareporter.com/articles/icsid-annulment-proceedings-lodged-by-claimants-in-cafta-case-against-nicaragua-are-discontinued/ (requires subscription)