I would go a step further and impose restrictions on the few Tiong banks here (BOC, ICBC etc), blacklist all Tiong (including newly minted 'Sinkie citizens‘) from Western Union and various other remittance agencies.
And heavily tax all parcel deliveries to China.
Chinese Nationals In S’pore Reportedly Send Panadol & Other Medicines Home In Bulk Amid Shortage
Be ruthless and take the gloves off. Enough of half-fuck measures. Tell the Chicoms at 150 Tanglin Road to go fuck themselves.