Newly released data from the U.S. Commerce Department reveals a notable drop in shipments of semiconductors and other restricted goods from China and Hong Kong, which are fueling Russia’s war efforts. Despite the decline, Hong Kong remains a key hub for evading global sanctions.

From January to May, advanced microelectronics through Hong Kong fell 28 percent, while through mainland China fell 19 percent. U.S. officials, while cautiously optimistic, stress that China remains a major concern.

The U.S. and its allies accuse China of aiding Russia by exporting vital parts for Moscow’s military. Aggressive sanctions and enforcement measures have been imposed globally on entities, including shell companies in Hong Kong, that divert semiconductors to Russia.

(With input from agencies.)