Alliance chief says troops could be sent into Turkey

Divisions between members over Ukraine and IS may hamper organization's unified response

NATO said it was prepared to send troops to Turkey to defend its ally after violations of Turkish airspace by Russian jets bombing Syria.

Officials at the US-led alliance are still smarting from Russia's brief weekend incursions into Turkey's airspace near northern Syria, and NATO defense ministers are meeting in Brussels with the agenda likely to be dominated by the Syria crisis.