Gordon Carrera

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What does the threat from Russia look like if you're on its borders?

And are Western spies and governments agreed on how to confront it?

Well, welcome to The Rest is Classified.

I'm Gordon Carrera.

This time there's no David McCloskey.

That's because I'm actually in Estonia, one of the Baltic states in its capital, Tallinn.

I'm here for a security conference at which...

officials, spy chiefs, other types are all meeting to try and look at some of the threats, particularly from Russia, some of the issues around Ukraine, but also the NATO alliance, how it's getting on, what the relationships with the Americans are like.

I've been here actually chairing a panel with some of the spy chiefs from the region.

I'd love to tell you more about that, but I'm afraid that really is classified because it was an off-the-record panel.

But I've spent a couple of days here also going down to close to the Russian border for a military exercise called Spring Storm, watching Estonian Defence Forces work with French troops there.

who were there in some camouflage vehicles, and some British troops who were camped in the woods in some, I think, less glamorous conditions than the French, strangely enough, using some sensor devices which were hidden in trees and which could detect

using video imagery, but also seismic activity, whether, for instance, Russian troops might at one point go over the border, all part of this exercise.

And it's all a sign really that Estonia, the Baltic states are on the front line from the Russian threat.

I mean, very, very close.

While we were going to this exercise at one point, we went just a couple of miles from the Russian border and were told to put our phones on airplane mode.

The reason being that otherwise they might switch to a Russian mobile phone network.