The Taliban takeover in Kabul is a "failure of the international community," Britain's Defense Secretary Ben Wallace said Monday, as London called for a G7 leaders' meeting on Afghanistan. 

The UK defense minister said the West's job in Afghanistan was only half-done. "If it's a failure, it's a failure of the international community to not realize that you don't fix things overnight," he said. 

"All of us know that Afghanistan is not finished. It's an unfinished problem for the world and the world needs to help it," he told BBC television. 

In wake of Taliban's regain of power, UK Prime Minister Boris Johnson also urged G7 leaders to discuss the situation in the South Asian nation and to prevent humanitarian fallout.

Downing Street said on Monday that Johnson "outlined his intention to host a virtual meeting... in the coming days," during a call to French President Emmanuel Macron, when he stressed the need for a "unified approach."