At a breakfast meeting focused on Russia, NATO foreign ministers agreed on "the scale of Russian aggression" and that it "requires a response", according to the USA official, who was not authorized to discuss the closed-door meeting publicly and spoke on condition of anonymity.
"NATO should not return to business as usual with Russian Federation until Moscow shows a clear change in its actions", he added.
"We need more air defense".
Pompeo's presence at Nato was seen as crucial as the alliance prepares for a July 11-12 summit in Brussels where Nato leaders are set to agree a new deterrent to Moscow, including a command to defend the Atlantic in the case of conflict.
They discussed ways to combat growing regional threats from both Russian Federation and Iran, and ways to strengthen the worldwide alliance.
The NATO chief said they also discussed the situation in Syria.
"When tensions are high, it is even more important to talk with Russian Federation".
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The victims are "predominantly female", police have said but have not elaborated on whether the victims were targeted. Anne was an employee at Invesco, a USA -based investment management firm.
Some allies, including Europe's economic powerhouse Germany, have been reluctant to meet a commitment made at a North Atlantic Treaty Organisation summit in Wales in September 2014 to spend two percent of GDP on defence by 2024. That commitment was made in 2014 and thus far only six of the 28 countries who made the pledge meet the goal.
Russian President Vladimir Putin said earlier this month that the production and delivery of the S-400 system is being accelerated and Cavusoglu told reporters on Friday that "Russia is speeding up the process".
The ministers, holding their 70th and final meeting before moving across the road to NATO's new, sprawling billion-dollar premises, will also discuss Georgia and Ukraine's aspirations to join the world's biggest military alliance.
Discussions will also be held on other key global issues, including the Iran nuclear deal, a training mission for Iraq, closer cooperation with the European Union and the prospects for peace in Afghanistan. "It reconfirms the commitment of the U.S. and President Trump to the transatlantic bond".
Despite the hawkish reputation of US President Donald Trump´s new top diplomat, the 29-member alliance agreed to continue its dual-track policy towards the Kremlin of defence and deterrence coupled with an offer of dialogue. A spokeswoman from State Department said that Pompeo will then go to Saudi Arabia, Israel and Jordan.
"I did come straight away, I was sworn in yesterday and I hopped on a plane", Pompeo told NATO Secretary General Jens Stoltenberg as he arrived.