As the ship was host to a S-300F system, roughly analogous to the US's AEGIS missile defense, getting distracted by a single drone sounds like it should be yet another black eye in this whole chain of events.
I mean private persons can use drone swarms to put pictures on the night sky.
And while they are rout pre-programmed, it's not hard to use a template to very fast pre-program a drone swarm to fly some pseudo randomized pattern around a ship of which the position is known.