The classics are the point. These aren't meant to be secretive killings, the signature is the message.
They would use a different method if they wanted to obscure responsibility, dispose of the body, or do any number of things differently. Because they didn't, means it was a public signing statement.
Whether it was intended for one recipient, or many, who's to say. Either way, you can be sure the intended party, or parties, received it.
Well. You'd need to avoid windows, tea, people with umbrellas (OK not directly Russian, but soviet era eastern europe), aeroplanes, cars. And if they really want to get you, they'll go old school and use a gun, or perhaps even a missile if you annoy the right people enough.
I'd love to go to Moscow. From all I've seen, it's a beautiful city. I'd also love to go to St. Petersburg and see the Hermitage.
But not while Putin is in power. Maybe one day when elections are fair and queer people aren't oppressed, but I won't be holding my breath for that happening in my lifetime sadly.