Zelensky warns of Russian mobilization and missile shortages, late May 2026

What we know

• 01Zelensky sent US President Trump an urgent letter warning of Ukraine's critical missile defense shortages around 27 May 2026.
• 02Zelensky warned that Russia was preparing a new large-scale attack.
• 03Ukraine stated that Russia's Oreshnik missile is not as cutting-edge as Russia claims, after examining recovered parts.
• 04Ukrainian senators from both US parties pushed Defense Secretary Hegseth for action on Ukraine aid around the same period.