Saudi Islamic scholar Sheikh Aseem Al-Hakeem said in a March 25, 2016 Q&A session at the Islamic Learning Centre in Kuala Lumpur, Malaysia that jihad serves to spread Islam and shari'a law to other countries. 

He said that non-Muslims who refuse to accept Islam when called to it must pay the jizya poll tax and be ruled by shari'a law, and that if they refuse to do so then the Muslims must fight them, enslave them, and take their lands. 

Sheikh Al-Hakeem elaborated that this is not possible today because the Muslims are weak, but that in 40 or 50 years the Muslims may be more "Islamically oriented" and capable of waging Jihad. 

Source: The Internet - "TheYayasanTaalim account on YouTube"