Proposal
With each embassy, the endorsement level needed to assume the delegacy would be greater. The exact formula of how an embassy would enhance a region's security would have to be a balanced and nuanced affair - I would suggest every embassy would be worth 10% of the endorsing region's endorsements, with a maximum of +20 (after elapsing that bonus, regions would no longer gain security from more embassies).
I think to make this a more balanced proposal - the cancelling of embassies would have to take less than 3 days. Instant cancelling, but a 3 day wait-period for the construction of embassies. Otherwise, liberations will probably become prohibitively impossible in all cases while piling remains as a tactic. This balances out as a game change, because taggers would be able to cancel embassies with a region instantly - which is more dangerous if embassies are important for a region's regional security.
EDIT: We might also have to consider a limit on how many embassies a region can have - to prevent large defender regions like 10000 Islands and The Rejected Realms and Lazarus from just approving embassies with everyone. A 50 embassy limit or something like that would curtail that practice to a more reasonable limit.
EDIT-1: Bears Armed notes that allowing players to reject or cancel their own endorsements would resolve the issues that buffers would cause for native delegate transitions. That's an elegant solution.
Pros
- Tight-knit communities with low endorsement counts, like roleplayer regions and leftist or rightist regions could organize their own security networks - where they all embassy each other to improve their collective security. I'm imagining communities like International Incidents would have sign-up sheets for their own networks.
- Smaller regions would be able to make themselves more secure - instead of needing five or six invaders to invade their regions, invader organizations would need twenty or thirty invaders which makes the whole process more difficult although not impossible.
- This gives more value to embassies and diplomacy. Regions can take their security into their own hands to a much larger degree.
- Encourages invader groups to invade with larger numbers.
- Invaders will now be strategically encouraged to not remove embassies with regions that they intend to occupy - although they will be encouraged to remove embassies with regions they don't intend to occupy (i.e., tag-raids) - which they already do.
Neither Pros nor Cons Necessarily
- Your first thought may be that this proposal will make it harder for newer invader organizations and tag-raiders who want to invade, but with two or three people instead of larger communities. However: there will still be countless regions out there that don't embassy with anyone - these regions will be as open for tag raids as ever.
- The more embassies that a region has, the harder it will be to liberate said region - natives and defenders will have to contact allies of occupied regions and inform them that they need to cancel their embassies with said region.
- Assuming a cut-off to the bonus (I've proposed 20+), this proposal helps smaller regions more than larger regions - 20+ endorsements for GCRs is almost a negligible bonus. This helps balance out the proposal, because larger regions will not see it in their interest to significantly help out smaller regions for little benefit for themselves. This encourages cooperation among smaller regions.
Figure 1. As the number of members in a region rises, the value of this proposal to a region's security declines, because 20+ endorsements becomes a negligible security advantage and invaders will switch to different tactics with larger regions anyways which involve covert tarting, as opposed to sheer invasions. Besides, I imagine larger regions will have mostly embassies with smaller regions bumming off them for "phantom" endorsements - two regions with 200+ endorsements endorsing the same small region would be inefficient and nonstrategic.
Cons
- Invaders, to take the regions that they prize as targets right now, will have to increase their number of updaters.
- Liberations will become more difficult. I suspect though defenders will be able to talk regions into closing their embassies, invaders will propose embassies with their own targets rising their defenses over the three days to make up for the lost embassies.