The U.S. and Europe’s biggest logistics firms have halted shipments to Russia, further isolating the country’s businesses and consumers after its military invaded Ukraine.

DHL and Kuehne + Nagel AG, Europe's largest freight forwarders, said they suspended inbound deliveries to the country, adding to the restrictions facing Russia after Moscow closed its airspace to European Union countries. 

“Our inbound services to Russia and Belarus have been suspended, which is why we are also not accepting shipments to those countries until further notice,” DHL said in a statement on its website Wednesday. The company, a unit of Deutsche Post AG, has helped provide coronavirus vaccines and other materials for fighting the pandemic to Russia.

DHL has also closed offices and operations in Ukraine “until further notice.”

U.S.-based United Parcel Service Inc. and FedEx Corp. suspended both inbound and outbound services to Ukraine, as well as deliveries to destinations in Russia, the companies said Sunday in online statements.

Deliveries from Europe to Russia are still possible by road, but are being conducted by a shrinking pool of smaller companies, according to Bloomberg. Larger firms with operations in the U.S. and concerns about their reputations are no longer willing to transport goods there.

Shipping giants A.P Moller-Maersk A/S and MSC Mediterranean Shipping Co. on Monday said they’re halting trade in the region, joining Hapag-Lloyd AG and Asia’s Ocean Network Express Pte in stopping services.