The shortage isn't here yet, at least not apparent on internet sites. Local stock will be the first to disappear. Actually it is already gone in some areas as OP stated.
If you own an eastern bloc rifle or pistol one would be wise to either sell it, stock up on some cheap ammo, or buy dies and brass now.
This adm. won't let a good crises go to waste and congress is likely to support legislation that bans weapons and ammo from Russia.