After World War III, Japan seized control of these Islands under no protest. The resident Russian population was allowed to remain as immigrants, and many of them accepted the situation on Ostrov Iturup, the most populace of islands. Clashes still occur between the different ethnic groups on the Ostrovs. Several abandoned Russian military bases sit still, unoccupied. At least two naval bases were also abandoned and even an underground submarine dock. Several corporations like Sagawa shifted facilities onto Iturup, moving onto the old base facilities. A Geofront was also constructed there. Because of the massive immigrant population, and the precarious political position of the islands, several black markets exist, especially on Iturup.