www.bbc.co.uk/news/world-europe-61106245
Ukraine's battle for control of its skies
"We can't cover the whole airspace," Capt Kravchuk says simply.
The fact he is even sitting here speaking to us is somewhat remarkable - especially given the fact that "many air defence facilities were destroyed fully or partially" in the first days of the war.
It's a rare public admission by Ukrainian forces that they suffered significant losses in the early stages of the war.
And
Russia already had a significant advantage in the air, deploying more than three times as many combat aircraft as Ukraine. The US Pentagon says that Russian aircraft have been flying around 250 military missions and carrying out some 30 air strikes every day. Western officials still say that Russia is struggling to gain air superiority.
But in contrast, Ukraine's aging fleet of mostly MiG-29 fighter jets have been struggling to compete, managing at best around 10 military missions a day.
And
But while Capt Kravchuk says his country is grateful for those shoulder launched weapons, known as Manpads [Starstreak and Stingers], he says they're only effective on the frontline.
This is because Manpads - man-portable air defence systems - are most effective against low flying aircraft. Russia is mostly using long range cruise missiles and high-altitude bombing.
Capt Kravchuk told the BBC: "We now lack medium and long range air defence systems... we do not have enough."
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Ukraine is having to use its air defences not just to target Russian aircraft, but also Russian cruise and ballistic missiles. They are having some success, but they can't destroy everything.
Capt Kravchuk estimates that his unit is shooting down between 50-70% of Russia's longer-range missiles. As an example, he says when Russia fired six missiles around Dnipro recently they managed to stop four.
Purpose of the article
But the harsh fact is that, without more significant support, Ukraine will find it increasingly hard to defend itself from Russian air and missile strikes the longer this war goes on.