Russia is gathering forces for an autumn push against Ukraine's fortress belt — bad for Ukraine, which may lose its first fortress city and face a far tougher 2027.

• Russia's spring offensive collapsed under Ukrainian drones, but the front is stabilizing and Russia is adapting fast.
• Russia's main targets are Constantinovka and Slaviansk, the anchors of Ukraine's heavily defended fortress belt in the east.
• Constantinovka is nearly lost — Russian infiltrators already hold much of the ruined city and most experts expect it to fall.
• Russia is also hitting bridges and supply lines to isolate Slaviansk and softening up Kramatorsk and Sumy as diversions.
• Russia is turning drones on civilians in a "safari" campaign, and civilian deaths are up sharply this year.

Outlook: Russia likely takes Constantinovka and digs in over winter to set up a much larger, more dangerous spring 2027 offensive, making a ceasefire this winter very unlikely.