English to Russian Bus/Financial Ships, Sailing, Maritime letter of engagement

Attached is a draft of our normal letter of engagement. Under English law, which governs our contract, this letter once it is signed by us is enough to show the terms of our contract. However, if you will need to open a passport with your bank to effect payment, then you will likely require a document signed by both sides os it looks more like a contract in Russia.
Вот открытие счета в банке мне знакомо. Здесь, наверное, подазумевается та же операция, хотя не уверен.