Watch: Ukraine's highly mobile air defence units shoot down waves of Shahed drones sent by Russia

Ukraine is stepping up its air defences by using mobile air defence units which are capable of shooting down the incoming waves of Iranian-made Shahed drones that Russia is sending over.

Around the clock, these mobile groups target the constant drone strikes, leaving Ukraine's main air defences, like the S-300, to engage bigger Russian missiles. 

Lieutenant General Serhiy Nayev, Commander Joint Forces, Armed Forces of Ukraine, explains their tactics: "Our groups are scattered, there are hundreds of them so, by saturating our air defence system with such groups, we increase their effectiveness – this is how we achieve success." 

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The Iranian drones are slow flying and rely on a GPS bearing, so can be efficiently taken out by machine gun fire.

As the kamikaze drones are primarily attacking Ukrainian power stations, the Ukrainians know roughly where to locate their defences.

In the autumn of last year, the UK committed to providing Ukraine with 125 anti-aircraft machine guns for this purpose.