One day after the Russian government lifted its ban on U.S. poultry imports, those imports were put on indefinite hold by the country, according to Associated Press reports.

Regulators canceled permits to import U.S. poultry and said Russian trading companies would have to apply for new ones. Russia’s Agriculture Ministry said the new permits were necessary because of changes in veterinary certificates and regulations for imported poultry. A ministry spokesperson said it is unknown how long the process would take or when Russian companies would be allowed to import chicken again.

The U.S. Embassy in Moscow said it was not clear on what basis the Russian government was denying the trading companies the right to import U.S. poultry. Russia formally lifted its month long ban on American chicken Monday, after weeks of negotiations with U.S. officials, but warned that it was still not satisfied with the quality of U.S. poultry meat.

Russian veterinary officials have alleged that sanitary conditions in the U.S. plants were poor and objected to the use of antibiotics and feed additives in U.S. chicken production. Russian officials said that they would not accept poultry from 14 plants that supplied product contaminated with Salmonella, nor from four U.S. states, Maine, North Carolina, Pennsylvania and Virginia.

American Meat Institute, Associated Press