NATO leaders pledged to bolster Europe’s defenses in the face of an “arc of instability” from Moscow to North Africa.

Heads of the alliance’s 28 countries meeting in Warsaw said they are determined to remain united in tackling “unprecedented” challenges from Russian aggression and Islamic State terrorism, according to a draft of the summit declaration.

The North Atlantic Treaty Organization vowed to establish a “constructive relationship” with Russia, as it agreed to boost troop numbers on its eastern borders, stepped up its resilience to cyber attacks and hybrid warfare and reinforced ballistic missile defense.

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