“We will be more forthright in the defence of our values, not least because a world of greater freedom is a fundamental part of how we keep our people safe”.
Obama and Cameron appear to suggest that NATO should play a role in containing the militants, but were not specific in what action they would seek from the alliance.
The two leaders were to visit with students at a local school today morning before joining their counterparts from France, Germany and Italy to discuss the crisis in Ukraine.
New Ukrainian President Petro Poroshenko was also to join the discussion in a show of Western solidarity with his embattled nation.
NATO leaders are expected to agree this week on the creation of a rapid response force that would set up in nations in the alliance’s eastern flank to serve as a deterrent to Russia.
Baltic nations and others in the region fear Moscow could set its sights on their borders next.
“We must use our military to ensure a persistent presence in Eastern Europe, making clear to Russia that we will always uphold our Article 5 commitments to collective self-defence,” Obama and Cameron wrote.
Under Article 5 of the NATO charter, an attack on one member state is viewed on an attack on the whole alliance. Obama reiterated his support for that principle Wednesday during a visit to Estonia, one of the newer NATO members set on edge by Russia’s provocations.