Russia¡¯s ?Foreign Ministry said on Wednesday that Moscow had summoned the Japanese ambassador in protest over ?an investment made ?by a ?Japanese startup in ?Ukrainian interceptor drone technology.

The Japanese company, Terra Drone, ?said in March it had invested an ?undisclosed sum in Ukrainian interceptor-drone producer Amazing ?Drones, which ?produces technology designed for rapid deployment on ?the battlefield.

The ?Kremlin has described ?Russia¡¯s relations with ?Japan ?as having been ¡°reduced to zero¡± over what it casts as Tokyo¡¯s ¡°unfriendly stance¡± toward ?Moscow.

Relations between Moscow and Tokyo, who have not signed a formal World War ?II ?peace treaty, have ?been strained for decades over ?an unresolved territorial dispute over the Kuril Islands, known in Japan as ?the Northern Territories.