At a NATO summit in Brussels on Thursday, Mattis said Russia must first "prove itself" and follow international law before the US and NATO can consider closer military ties. He called the transatlantic bond "as strong as I've ever seen it", and stressed America remained "rock solid" in its support of Article 5 -- NATO's core collective-defence tenet that says an attack on any country will be met by a response from the alliance. Likewise, Tillerson was cautious in his dealings with Russia, despite Trump's pledges for closer ties. Following his first sitdown with Russian Foreign Minister Sergei

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