MK5-MIL Weekly Report

Russia–Ukraine War — September 18, 2026

The Russia-Ukraine war remains strategically deadlocked, but several pressure points shifted during the past week. Ukraine regained some battlefield initiative around Lyman, the deep-strike campaign against Russian infrastructure expanded, and European governments became more concerned about Russian pressure near NATO territory. The clearest change is the growing separation between the ground war and the infrastructure war. Front-line movement remains slow, while long-range drones and missiles can create strategic effects hundreds of miles away within hours.

Ukraine disrupts Russia around Lyman

Ukraine's Operation Vivaldi has produced one of Kyiv's more notable local successes in recent months. Ukraine's 3rd Army Corps says Ukrainian forces cleared or recaptured about 85 square kilometers northwest of Lyman. Ukrainian forces also attacked Russian logistics as far as 120 kilometers behind the front, forcing Russia to disperse fuel, ammunition, command posts, and other support infrastructure. The Institute for the Study of War assesses that the operation disrupted Russia's attempt to form the northern side of a wider encirclement of Ukraine's fortified cities in Donetsk Oblast. Russia can still attack the same defensive belt from other directions, so the Ukrainian gains don't represent a broad battlefield reversal. MIL reads Operation Vivaldi as evidence that Ukraine can still create local operational surprise when Ukrainian commanders combine drones, electronic warfare, interdiction, and tight operational security. MIL signal: modest improvement for Ukraine, but not a strategic breakthrough.

The deep-strike war is becoming more important

Ukraine continues to hit Russian oil, military, and defense-industrial infrastructure far behind the front. Ukrainian forces struck the Syzran refinery this week along with drone-production facilities and military targets in several Russian regions. Earlier attacks also damaged refinery and industrial infrastructure elsewhere in Russia. The refinery campaign now produces effects beyond Russia's military logistics. Global diesel supplies are already tight, and disruptions to Russian refining have contributed to higher fuel prices. The economic consequences give Washington and other Ukrainian partners reasons to care about which Russian targets Ukraine selects. MIL sees a new linked constraint: successful Ukrainian refinery strikes can reduce Russian refining capacity, tighten fuel markets, increase political pressure abroad, and create greater pressure on Kyiv's target selection. Ukraine's ability to reach a target doesn't automatically mean Ukraine has unlimited political freedom to keep attacking the target. The constraint could become more important if the refinery campaign grows.

Russia is changing the economics of its air campaign

Russia is adapting its own long-range campaign. Russian forces are increasingly using converted RM48U air-defense training missiles for ground attack. More than half of the 228 ballistic and hypersonic missiles Russia launched during July and early August reportedly came from the converted missile family. The RM48U isn't especially accurate, but precision may not be the primary purpose. Large numbers of cheaper weapons can force Ukraine to expend scarce Patriot interceptors while Russia preserves more capable missiles for other missions. Russia is therefore attacking Ukraine's interceptor inventory as well as physical targets. The competition increasingly looks like an exchange-rate problem: Russian missile and drone production versus Ukrainian interceptor production and resupply. Russia doesn't need to win every individual engagement. Moscow gains an advantage if Russian forces can make Ukraine spend defensive weapons faster than Ukraine and its partners can replace them.

Energy negotiations haven't stopped the energy war

Diplomatic activity continues, but negotiations haven't produced a durable halt to infrastructure attacks. Ukrainian President Volodymyr Zelenskyy has said Ukraine is prepared to participate in a reciprocal ceasefire covering energy targets. Russia has also publicly discussed restrictions on energy attacks. Russian and Ukrainian forces continued striking energy-related targets this week despite the diplomatic effort. MIL still sees a limited infrastructure agreement as more plausible than a comprehensive ceasefire. An energy agreement would give both governments something concrete to exchange. Russia can stop attacking Ukrainian energy infrastructure, while Ukraine can stop attacking Russian refineries and related facilities. Territorial disputes, security guarantees, sanctions, and the status of occupied Ukrainian territory would remain unresolved. A narrow agreement could therefore coexist with continued fighting along the front. MIL signal: diplomacy remains active, but negotiations are narrowing toward bounded deals rather than a settlement of the war.

NATO's gray-zone problem is getting harder to ignore

The most important escalation risk isn't necessarily a Russian armored attack on NATO territory. Polish Prime Minister Donald Tusk warned this week that intelligence available to Poland indicates Russia could use drones or missiles against NATO countries while attempting to present the attacks as accidents. European governments are also reporting increased concern about sabotage, cyberattacks, drone incursions, and other hybrid threats. Latvian President Edgars Rinkēvičs separately warned that European air and drone defenses haven't kept pace with the rapid evolution of aerial warfare in Ukraine. The warnings don't prove that Moscow has ordered a specific attack against NATO. They do strengthen a pattern that MIL has been tracking for months. Russia can test NATO without launching an invasion. A drone crossing, sabotage operation, cyberattack, or deliberately ambiguous missile incident could test how quickly NATO members detect an event, attribute responsibility, coordinate politically, and decide whether collective-defense mechanisms apply. Ambiguity becomes part of the weapon. MIL continues to assess a deliberate conventional Russia-NATO war as less likely than continued gray-zone pressure around NATO's eastern flank.

Winter is the next major stress test

Russia is entering another winter with a larger and more adaptable drone and missile arsenal. Newer Russian jet-powered drones are faster and harder for Ukrainian defenses to intercept, while Russia continues to attack Ukrainian infrastructure and logistics. Ukraine is pursuing the opposite pressure campaign against Russian fuel, logistics, air-defense, and defense-industrial systems. The winter campaign could therefore produce two parallel wars. The ground war will continue to revolve around incremental territorial gains, local counterattacks, and attrition. The infrastructure war will move much faster as both countries try to weaken the systems that allow the other side to keep fighting.

MIL outlook

MIL expects continued fighting with bounded negotiations during the next several weeks. Ukraine's success around Lyman weakens one Russian operational plan but doesn't overturn the battlefield. Deep strikes are becoming more strategically important, although fuel-market consequences could constrain Ukraine's freedom to attack Russian refineries. Russia is increasingly trying to exhaust Ukrainian air defenses through volume and cheaper weapons. The NATO perimeter deserves closer attention. A conventional Russian attack remains a different and much larger decision than a deniable drone incursion, sabotage operation, or other ambiguous probe. The most important indicators for the next report are Russian winter strike tempo, Ukrainian refinery attacks, Patriot interceptor availability, progress toward an energy-strike agreement, and any new Russian-linked incident on NATO territory. Overall MIL assessment: strategic deadlock, increasing infrastructure pressure, and rising gray-zone risk around NATO.