契約を履行できず、違約となった。
Keiyaku o rikou dekizu, iyaku to natta.
We were unable to execute the contract, resulting in a breach of contract.
違約により生じた損害賠償を請求する。
Iyaku niyori shoujita songaibaishou o seikyuu suru.
We demand compensation for damages resulting from the breach of contract.