A contract can be explicitly modified by verbal agreement, or can be entirely verbal, but
oral agreements face evidence problems, namely, what exactly did A and B say?
The claimant alleged that he was entitled by an
oral agreement to a share of a Russian company known as «Rusal», that English law and jurisdiction had been orally agreed, and that it would not be possible to bring his claim in Russia since he would
face assassination, arrest on trumped - up charges and the lack of a fair trial.