[shmerl]

Probably fear. Putin's nazi mafia could dispose of the crew or target their families if they do that.

[SanjayMehta]

Or Trump's pirate navy could call them drug dealers and blow them out of the water.

[shmerl]

They work for Putin's war, so they they should be treated as hostile navy anyway. They'd be lucky if they'll end up arrested and not blown up. Ukraine does blow them up already when opportunity presents itself.