Some countries or entities are subject to trade sanctions or embargoes, and some products are classified as dual-use, meaning they have both civilian and military applications and are restricted accordingly. Screening your supplier, your bank, and sometimes your end customer against relevant sanctions and restricted party lists is a real compliance obligation, not an optional extra, particularly if your bank or country enforces international sanctions regimes.
If in doubt about whether a specific product, country or counterparty carries sanctions exposure, check with your bank or a trade compliance professional before committing to the transaction, since sanctions violations carry serious legal and financial consequences even when unintentional.