STORY HIGHLIGHTS

Newport, Wales (CNN) -- NATO members agreed Friday to form a "spearhead" force of several thousand land troops ready to deploy within a few days, NATO chief Anders Fogh Rasmussen said, as the trans-Atlantic alliance grapples with the threats posed by Russia's interference in Ukraine and the rise of ISIS in Syria and Iraq

The troops would be backed by air, sea and special forces support, he said, with a command and control center and extra equipment in Eastern Europe.

"This decision sends a clear message: NATO protects all allies at all times," Rasmussen said on the second day of a NATO summit in Newport, Wales.

"And it sends a clear message to any potential aggressor: Should you even think of attacking one ally, you will be facing the whole alliance."

The new readiness action plan, which includes proposals for more short notice exercises, is intended to help NATO respond swiftly to Russian aggression and other international conflicts.

"In these turbulent times, NATO must be prepared to undertake the full range of missions and to defend allies against the full range of threats," Rasmussen said.

He said NATO members also "stand ready to assist Iraq" in its fight against Islamist extremists if Baghdad asks for help.

But pressed by reporters on exactly what aid NATO would offer, Rasmussen toned down his remarks, saying NATO is prepared to consider a "defense capability building mission" in Iraq.

Responses to threats posed by Russia's interference in Ukraine and the rise of ISIS in Syria and Iraq were at the heart of discussions Thursday on the first day of the alliance's meeting in Wales.

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NATO to create 'spearhead' force