"Edmund Fitton-Brown, senior adviser at the Counter Extremism Project and the UK's former ambassador to Yemen, added to these concerns.

He pointed to the Yemeni Houthi rebels, another arm of Iran's "axis of resistance", as a further threat to consider as the conflict in the Middle East potentially spreads.

Fitton-Brown noted the importance of both groups, but maintained Hezbollah as the more "crucial Iranian asset", adding the worrying warning that it cannot be stopped by Israel."