The city where Russia cannot hide its warships

The ship spotters of Istanbul have become a key resource for diplomats and intelligence experts, alerting the world to the scale of Russia's campaign in Syria.

It's almost midnight. I've just got to sleep at the end of a long day travelling to Istanbul, when my phone beeps with a message.
"Slightly bad news," it says.


"Alexander Tkachenko will enter Bosphorus at 04:20.
"Very inconvenient. There is absolutely no guarantee we will see anything at all."
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