It is expected Britain will provide Ukraine with a range of armoured vehicles, some of which were previously deployed on operations in Afghanistan. They include the Mastiffs, which can carry eight troops plus two crew and are typically used for road patrols and convoys. 

The Mastiff was armed with machine guns and grenade launchers when deployed by British forces, but it is understood the Ukrainian military will mount their own weapons. 

Defence sources told The Telegraph that Ukrainian troops were likely to be trained on how to use the vehicles, which are left-hand drive, in a neighbouring country.

The sources added that an initial batch of 120 armoured vehicles would be sent to Ukraine, including Mastiffs and a range of other models, possibly increasing to 200 over the coming months.

The agreement comes after British defence ministers this week hosted a Ukrainian government delegation to allow them to view stocks of military equipment.

Mr Wallace said on Friday: “It is very important that we do what we can to help Ukraine and where they ask us for equipment and we’ve got it, we can provide it.”

The £100 million package of support unveiled by Mr Johnson will include more Starstreak anti-aircraft missiles, anti-tank weapons and “precision munitions” such as drones capable of loitering in the sky before striking.

These are the same missiles that have been seen in videos from Ukraine destroying Russian tanks and bringing down helicopters.