A strong court case begins with reconstruction of the transaction. It is necessary to show not only that a contract existed, but also what specific obligation the Ukrainian counterparty assumed, when performance became due, what the foreign party did, and exactly how the counterparty failed to perform.
The relevant evidence may include the contract and its annexes, specifications, purchase orders, invoices, bank documents, acceptance certificates, delivery notes, transport documents, technical materials, and all material correspondence. Particular attention should be paid to changes that the parties made in practice after signing the contract: revised deadlines, amended quantities, project stages, payment arrangements, or revised requirements for the result.
In a non-payment dispute, the essential chain is typically: delivery or performance — acceptance — amount due — payment deadline. In a quality dispute, the focus is on contractual requirements, acceptance documents, and timely recording and notification of defects. In a delay dispute, the original deadline and all subsequent extensions matter. In a damages claim, it is necessary to prove not only the amount of the loss but also the causal link between that loss and the Ukrainian counterparty’s breach.
A separate difficulty arises where the commercial documents do not correspond with each other. The contract may be concluded with one company while documents are signed by another; one deadline may appear in the specification and another in email correspondence; part of the work may be accepted without reservations while the client later seeks repayment of the entire amount. These inconsistencies should be identified and resolved before proceedings are commenced, rather than explained for the first time in court.