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11 Across: i?e?a? 6 letters
Lativian capital will lead this European region to Africa but Swiss capital will take it to Russia.

23 Down: t?o?g 5 letters
One of highest degree and I get involved and leave sound type with just her skimpy panties.
(Obvious answer is thong but I can't relate it to the clue)

11a IBERIA

11a Iberia (becomes Liberia or Siberia)

11ac IBERIA. Add an L or an S at the front
23dn must be THONG. I imagine you have to jumble and remove PhD (high degree) and I from diphthong (sound)