How will the UK's military aid package help Ukraine?
Storm Shadow missiles
Clarke says what might make a difference to the Ukrainians are Shadow Storm long-range precision-guided missiles that troops have found useful in the past.
"I suspect we are now dipping into our own stores and MBDA - who make the missiles - certainly can't make the number that we are now giving," Clarke adds.
"I suspect we are giving some from our own stock and it will take a couple of years to build up again. This is a fair sacrifice."
Husky vehicles
Also being given are 160 Husky vehicles, which Clarke says are "unglamorous but make a difference when fighting a battle".
"These are mine resistant vehicles that are useful around the combat zone," he says.
The UK has also pledged four million rounds of ammunition, which Clarke says is not enough, but other European countries are finding ways of getting more munitions.
https://news.sky.com/story/ukraine-war-russia-news-putin-nuclear-live-updates-kyiv-12541713