South Korea has concluded that Russian support likely enabled North Korea to put a spy satellite into orbit for the first time this week, and will know whether it is functioning properly by early next week, officials said Thursday. The launch has deepened regional animosities, with both Koreas threatening to breach a past reconciliation deal and taking hostile actions along their heavily armed border.

After two launch failures earlier this year, North Korea said it successfully placed its “Malligyong-1” satellite into orbit on Tuesday night. South Korea’s military has confirmed that the satellite entered orbit, but said it needs several more days to verify whether it is working properly.