The message from the Russians to the Ukrainian patrol was clear: Go no further. As Russian ships deploy to the Sea of Azov for what Moscow says are exercises, the Ukrainians ready their defenses. CNN's Matthew Chance reports.

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Welcome to the discussion.

Please keep it clean, turn off CAPS LOCK and don't threaten anyone. Be truthful, nice and proactive. And share with us - we love to hear eyewitness accounts.