Some in-depth analysis (at least by Twitter standards) from David Patrikarakos:
It's worth pointing out that Ukraine's navy lost some 50 ships during the Crimea annexation...
A quick precis of what's now reportedly going down
It seems some Ukrainian veterans are going to organize an impromptu demonstration outside the Russian Embassy in Kyiv.
We have updated our news story to keep abreast of the latest dramatic developments. You can read it here.
The Ukrainian Navy is now saying that two of its ships have been seized and two of its servicemen wounded.
If you speak the language, you might also want to follow a live blog of the current escalation in the Sea of Azov that has been started by RFE/RL's Ukrainian Service.