Does Nato have the political will to face up to Russia?
Nato has rarely escaped the existential question in the years since 1989 and the fall of the Berlin Wall.
Now events in Ukraine, and accompanying statements from the Kremlin about acting to protect the interests of Russians in neighbouring countries, appear to offer a lifeline to the Western alliance - a "back to the future" mission organising collective defence against the threat of future coercion from the east.
It doesn't have to be complicated and it doesn't have to involve the alliance in new wars.
Indeed it can be argued that the whole strength of Nato during decades of Cold War lay in the simplicity of its mission and success of deterrence in avoiding actual conflict.
The organisation's founding charter, signed in Washington DC in 1949, is remarkable for its brevity.
What else happened in the Middle East as Gaza burned?
The Middle East is going through such turmoil that much has been going on during the month Gaza dominated the headlines. Here's my summary of the five key events.
1. The onward march of the Islamic State in Iraq
Ukraine crisis creates high-level tensions in UK
Senior officers in the armed forces and ministers have been at loggerheads about the implications of the Ukraine crisis for Britain's defence.
I've learned that Philip Hammond, as defence secretary, threatened one officer, General Sir Richard Shirreff, with disciplinary action after he gave an interview in March suggesting the armed forces were not capable of meeting this new challenge.
New alliances amid Middle East chaos
The great hope of the Arab Spring that began more than three years ago was that democracy and stability would break out across the Middle East.
It didn't happen. Instead there has been turmoil and bloodshed, with an elected leader turfed out in Egypt, Libya apparently disintegrating and a new jihadist group, Isis, capturing swathes of Iraq and Syria.
Iraq crisis: Where next in the struggle for the country?
For much of last week the battle for Iraq entered a kind of strategic pause, in which both sides attempted to adjust to the capture of Mosul and Tikrit by Isis and prepare their next move.
Over the past couple of days it has become clear this lull is over and that it is Iraqi Prime Minister Nouri al-Maliki's opponents who have got their act together first.
What does D-Day really mean to the mix of people in Normandy?
There are many commemorations of D-Day going on, from official to public, or those of the veterans themselves, and the scale of it all is perplexing.
These events have drawn hundreds of thousands of people to the Normandy beaches, all outwardly here for the same reason, but actually taking away very different things.
Powerful emotions stirring in Russia's 'divided nation'
In 1993, during a filming trip to Tajikistan, we chanced upon an extraordinary and disturbing scene.
Hundreds of Russians were huddling in railway cattle trucks, in sub-zero temperatures, desperate to escape the civil war ravaging a newly independent Soviet republic.
Ukraine crisis: West faces election nightmare
As the days pass without an overt, large-scale, Russian military intervention in eastern Ukraine, Western leaders are focusing increasingly on another nightmare scenario - that elections planned for 25 May will not be able to take place.
The nervousness about this possibility among US and EU politicians stems from a knowledge that despite their vocal support for the interim authorities in Ukraine, they are in fact, as Russian statements never cease to point out, an unelected group who seized power.