Which action is aimed at reducing smuggling and fraud against customs revenue?

The action focused on preventing and suppressing all forms of smuggling directly addresses the core issue of illegal activities aimed at evading customs duties and regulations. By actively working to eliminate smuggling, customs authorities can protect revenue streams that are critical for national budgets and public services. This approach involves various strategies such as increased inspections, training for enforcement personnel, and collaboration between agencies to detect and deter smuggling activities before they can impact customs revenue.

Monitoring all international shipments, while helpful, may not be as effective in the direct confrontation of smuggling since it doesn't inherently involve active measures to stop illicit activities. Increasing customs duty rates may push some trade behaviors but could lead to unintended consequences such as higher evasion rates. Providing tax incentives to importers could foster legal trade but does not specifically target the underlying issues of smuggling and fraud against customs revenue. Therefore, the action of preventing and suppressing smuggling is the most effective and direct method to safeguard customs revenues.