Navalny's apartment in Russia 'seized'

Russian opposition politician Alexei Navalny's bank accounts have been frozen and his Moscow apartment seized under a lawsuit while he was recovering from a suspected poisoning in a Berlin hospital, his spokeswoman Kira Yarmysh says.

"This means the flat cannot be sold, donated or mortgaged," Yarmysh said in a video posted on Twitter.

Navalny was flown from Russia to Berlin last month after falling ill on a domestic flight in Siberia.

Several countries have demanded an explanation from the Kremlin, which has denied any involvement in the incident and said it has yet to see evidence of a crime.

Yarmysh said Navalny's assets were seized on August 27 due to a lawsuit filed by the Moscow Schoolchild catering company.

A Russian court in October 2019 ordered Navalny and his allies to pay $US1.4 million ($A2 million) in damages for libelling the Moscow Schoolchild catering company.

The court said Navalny, his Anti-Corruption Foundation (FBK) and ally Lyubov Sobol had caused Moscow Schoolchild moral damage and told his group to delete a video in which they had called into question the quality of its food.

"In total, the court decided to recover 88 million roubles ($A2 million) from Navalny, Sobol and the FBK," Yarmysh said on Thursday.

"This is the amount it estimates in lost profit for Moscow Schoolchild because of losing a contract to provide food."