Ukraine Seeks Enhanced Air Defense
Russian attacks surged after May 24, with 90 missiles and 600 drones.
Zelensky urged partners to supply more missiles as stockpiles depleted.
Zelensky's letter emphasized urgent need for missiles in Patriot batteries.
Lavrov warned of targeting Ukrainian decision centers and urged embassy evacuation.
U.S. did not comment on the Ukrainian letter.
Analysis indicates Russia's drone defenses are failing, and Ukraine's Patriot stock is low.