Air defences.
In December, the US also announced it was sending the Patriot missile system to Ukraine - and Germany and the Netherlands have recently followed suit.
This highly sophisticated system has a range of up to 62 miles (100km), depending on the type of missile used, and requires specialised training for Ukrainian soldiers, likely to be carried out at a US Army base in Germany.
But the system is expensive to operate - one Patriot missile costs around $3m.
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