The Kardymovo oil depot in Russia's Smolensk region was hit by Ukrainian drones on September 11th, 2025, with reports indicating damage to a tank park containing 10,900 cubic meters of light petroleum products. This attack occurred within the reporting window of 9:31 PM to 10:01 PM UTC on September 11th, 2025, as part of widespread Ukrainian drone activity targeting the Russian Federation. The Ukrainian Air Force also noted a threat of ballistic weapons. In response to Poland's announced full border closure with Belarus, effective September 12th, Russia's Foreign Ministry spokesperson Maria Zakharova demanded the border be reopened, accusing Warsaw of "escalation" and stating the closure would harm international business. This statement was made on September 11th, 2025, as reported by United24media. US President Donald Trump commented on Thursday, September 11th, 2025, on a previous violation of Polish airspace by Russian drones, suggesting it "could be a mistake." This statement comes amid heightened tensions and increased military presence in the region, including NATO's doubled fighter presence over Poland and France's deployment of three Rafale fighter jets. Previous reports detailed over 115 Ukrainian drones crossing into Russia's Bryansk region, with many targeting Smolensk, causing explosions and fires, notably at a Lukoil facility. Ryanair CEO Michael O'Leary warned that Russian drones would disrupt European skies for years and called for tougher sanctions on Moscow. Sweden announced an $836 million military aid package for Ukraine on September 11th, 2025. Poland had previously deployed 40,000 troops to its borders with Belarus and Russia in anticipation of the Zapad-2025 military drills, and Latvia closed its airspace along its borders with Russia and Belarus as a precaution. Earlier on September 11th, at least five Russian drones reportedly entered Polish airspace, with two intercepted and three crashing.