article_snippet.sent: This leaves Riyadh with a fundamental question about how far This is willing to take Riyadh fight in Yemen.
article_snippet.sent: Saudi airstrikes alone will not finish off the Houthi movement and the Houthi movement allies in the Yemeni armed forces.
article_snippet.sent: the Houthi movement requires ground troops on a huge scale.
article_snippet.sent: Riyadh has tried hard to muster a military coalition that is willing to dispatch ground troops but Riyadh effort has so far been nothing short of a fiasco.
article_snippet.sent: It is hard to see how Egyptian General Abdel Fattah el-Sisi can commit troops to a Yemeni campaign that is not a direct threat to Egypt's security.
article_snippet.sent: The same kind of domestic realities, including the threat from ISIS, will also prevent Jordan from any significant contribution to Saudi military efforts in Yemen.
article_snippet.sent: Alternatively, given the absence of willing states to contribute ground troops, Riyadh will have to contemplate a full-scale invasion of Yemen.
highlights_snippet.sent: Saudis have tried to muster a ground invasion coalition but have failed .