Even before his confirmation on Thursday, the former Central Intelligence Agency director was already involved in US diplomacy, although it will be his first meeting at NATO, an organisation founded on collective defence against the threat from the former Soviet Union. Alliance units are routinely operating in the Baltic republics, Poland, Romania and Hungary.
The alliance remains open to talks with Russian Federation, the secretary general said, and the channels must remain open especially when tensions on the continent are high.
In a closed door meeting, Pompeo and fellow foreign ministers of the military pact forged a consensus on the need for a response to "Russian aggression", a U.S. official said, adding that Pompeo pressed allies to raise military budgets.
The alliance states are investing more in defense, he noted, with all North Atlantic Treaty Organisation nations spending more on security, including a number at, or approaching, the alliance's goal of member nations spending at least 2 percent of their gross domestic product on defense.
"It was clearly stated during my visit in Ankara that there is now close contact between the United States and Turkey on how to move forward in a way which is as coordinated as possible to avoid any unnecessary problems in northern Syria", Stoltenberg said referring to his visit to the capital on April 16. European Union High Representative/Vice President Federica Mogherini will join these discussions.
The head of NATO's cyber defense unit, Christian-Marc Liflander said that the S-400 system is not compatible with the air defense systems now used by the alliance.
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Discussions will also be held on other key worldwide issues, including the Iran nuclear deal, a training mission for Iraq, closer cooperation with the European Union and the prospects for peace in Afghanistan.
"Today we agreed on the concept of operations for our mission". Details will be confirmed at the summit in July, but Stoltenberg said it would involve several hundred personnel. The NATO forces will train Iraqi instructors, and help build Iraqi military schools.
Still, NATO officials see an "unprecedented opportunity" in Afghan President Ashraf Ghani's offer of unconditional peace talks accompanied by a cease-fire, the recognition of the Taliban as a political party and the release of some prisoners.
Pompeo will arrive in Riyadh on Saturday ahead of a series of events that could potentially plunge the region into deeper disarray, including Trump's decision by May 12 on whether to pull out of the Iran deal, and the opening of the new US Embassy in Beit-ul-Moqaddas two days later.
"We have completed the S-400 process".
The meeting will also address Ukraine's hopes for membership, aspirations that have been met with fury in Moscow.