"Oh, an 'armed embargo' is nothing goes in or out...also known as a siege."

Nope the term armed embargo doesn't exist apart from inside your own fevered imagination. What you are in effect proposing is a total blockade on Syria - Care to tell us how that would be managed?

Taking a look at the map the countries that you would have to get onboard to enforce that would be:

Turkey
Lebanon
Israel
Jordan
Iraq

Land borders are as porous as a sponge as was found during the so-called UN sanctions campaign against Iraq. Who is going to prevent Russian ships sailing to and from Syrian ports?

Put quite simply your blockade wouldn't work it would get no backing.