Ukrainian journalist Yuriy Butusov published a documentary about the most riskiest and complicated mission of the whole war in Ukraine - delivery of supplies, weapons and troops into besieged Mariupol via helicopters.
The helicopters took off from Ukrainian-controlled territory at 4-5 am in the dark, flew over it for 40 minutes, and then 40 minutes over the enemy - starting from Mileykino, the flight began over the sea.
The entire flight continued in extremely difficult conditions: in the dark at extremely low altitude - almost touching trees with landing gear. To somehow facilitate the flight at night, the pilots used Polish THL-5NV helmets with PNL-3 Orlik night vision goggles. 
The plan was simple - volunteers and weapons were brought to Mariupol by helicopters and then the helicopters took back the seriously wounded. In total, 72 people decided to become volunteers and join the besieged troops - including 9 doctors.
The Ukrainian forces managed to carry out 4 such raids - in 3 cases they were completely successful, in one case the helicopters were shot down on the way back, whilst taking out the wounded.
https://twitter.com/UAWeapons/status/1509484181922979842
There were also attempts to support Mariupol later than this- however, all the other times the helicopters were shot down before they even reached the city. How many helicopters were lost in total is not reported, but we think that about 4-5 losses are possible.
Here is the link to the full documentary which we really recommend watching to better understand one of the most intrepid operations of this war so far.
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