Overview

• Estonia secured an emergency UN Security Council session for Monday at 10:00 New York time, marking its first formal request for such a meeting in 34 years.
• Tallinn says three Russian MiG‑31s entered its airspace near Vaindloo for 12 minutes with transponders off and no flight plan, while Moscow denies any violation and claims the jets stayed on a planned corridor over neutral waters.
• Polish police reported new finds of debris resembling drones at two forest sites in Mazovia on September 21 and placed the areas under guard for military and prosecutorial investigation.
• ISW assesses that Russia is gathering data on NATO responses through recent airspace and infrastructure provocations, including reported low‑altitude passes near Poland’s Petrobaltic platform, which NATO and the EU condemned.
• Ukraine’s General Staff recorded 123 combat engagements on September 21, with the Pokrovsk sector identified as the most active and significant Russian losses reported.