Ukraine War: Russians shut down mobile internet

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[From the beginning of this war, I've been wondering so much about the Internet. I have been amazed at how long the Russians have left the Internet up. The Internet is a dangerous thing during a war, and it can work against you massively. Jan]

This is an excerpt from a war report:
Russian occupation authorities shut off mobile internet in occupied Luhansk Oblast on September 14, likely to preserve Russian operational security and better control the information environment as Russian forces, occupation officials, and collaborators flee newly-liberated Kharkiv Oblast for Russian and Russian-controlled territories.