The president also ‌warned that Moscow is seeking to significantly accelerate its ballistic missile production ahead of winter, when it is expected to renew its ​campaign against the energy sector. Advertisement AdvertisementUkraine has been short on U.S.-made Patriot interceptors capable of downing Russian ballistic missiles since the start of the war. In what has become a pattern in recent weeks, Ukrainian air defences failed to intercept a single one ​of the ​24 ballistic missiles and four Zircon cruise missiles fired ​during Wednesday's attack, the air force said. Last week, Moscow's troops fired the first two North ‌Korean missiles since last August, Ukraine said. A North Korean missile ​unit has begun deploying to western Russia and could be equipped ​with 120 ballistic missiles and six launchers, according ​to Ukraine's military intelligence.