When it loses the UK, the EU loses an important military power, which makes the remaining countries keener than ever to collaborate.
Obama has said he expects European allies to chip in their fair share of defense spending, and European public opinion supports it. But as a Tufts expert points out, many challenges in Europe remain.
The second organisational pillar of the European order isn't as threatened as the EU – but there's trouble ahead.
Forecasts that Britain's withdrawal from the EU will send the world into a state of war are wildly overblown.
A new book warns that a lack of Western resolve could lead to World War III.
A number of tripwires could set off a chain of events leading to war.
NATO has announced a new mission to monitor people-smugglers in the Aegean – but something smells fishy.
Turkey is the one of the U.S.'s most important allies in the Mideast, but recent actions such as the downing of a Russian fighter raise important questions about its reliability as a partner.
Recent talks in Vienna may help end the Syrian civil war, but diplomacy will not eliminate ISIS.
Russia's Syria play may have hit some snags already, but the US is hardly placed to kick up a fuss.
Airspace incursions are spilling over into wider tensions.
The face-off between Russia and the West in Syria is giving both sides a chance to try out their new high-tech weaponry.
Bombing a hospital and killing doctors and wounded or sick persons may seem to be an obvious war crime. But the reality of both the law and the facts is significantly more complicated.
With strong views on NATO and the EU, the new leader of the opposition is bound to ruffle feathers abroad.
A suicide bombing in Turkey last week has pulled Ankara closer to the US in the fight against ISIS. It has also raised concerns about Kurds who are also being targeted by Turkish bombing raids.
Ukraine is giving Russia two options – and neither is likely to end well.
A Pew survey has found majority of citizens no long support the principle or mutual aid and support.
With austerity on the agenda, the upcoming strategic reviews will be critical to deciding the future of the UK's defence force.
As the West and Russia go about rooting out each other's spies, they also lose the ability to keep tabs on each other. Time to get back in touch.
Through history, nuclear power has gone hand in hand with the nuclear arms race. But does it have to be this way? Closer international cooperation can help nations embrace nuclear power peacefully.