Русско-англо-русский юридический словарь

Fundamental Breach of Contract: A fundamental breach of contract is a breach that permits the aggrieved party to terminate performance of the formulated contract. In these scenarios, the non-breaching party is entitled to sue the breaching party for damages sustained. (contract-law.laws.com)

An innocent party may claim damages from the party in breach in respect of all breaches of contract. (uk.practicallaw.com)