Cryptic European Countries

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Across
  1. 9. No right way for eco-friendly oil giant. (6)
  2. 12. Established on empty Iona, it's baltic! (7)
  3. 14. Minute, old, endless oval was once part of USSR. (7)
  4. 16. Volcanic hotspot I'd left cane around. (7)
  5. 19. To tongue almost a dozen beer mugs, sounds like it's nowhere near the coast. (13)
  6. 21. Lop back and partition repeatedly. (6)
  7. 24. See ++
  8. 25. Real bus going round old white country. (7)
  9. 27. & ******** At once do harm in re-organising great Alex's birthplace. (5,9)
  10. 28. Harbour strange old french-man in former seafaring empire. (8)
  11. 29. In the valleys where big dolphins are heard. (5)
  12. 30. In old Livonia even all art's veinal. (6)
  13. 33. Am back initially looking to assess island base for crusaders. (5)
  14. 35. Knock out avails twisted home of old Pressburg. (8)
  15. 36. Hussars home - sounds like they're starving! (7)
  16. 40. Of this tree, we hear it's ownership is divided. (6)
  17. 44. Riotous din real source of drunken fights. (7)
  18. 45. Wonderful pastries, made by men confused in dark! (7)
  19. 48. Perplexing bulge? I'm full of beer and waffles! (7)
  20. 49. & ++++++++ Site of genocide, around a bad zone Rhona gives in. (6,3,11)
  21. 50. One in a car to change previous governments ban. (7)
  22. 51. Former grand duchy hit a nail around you hear. (8)
  23. 52. Well-known great uncle upsetting big Laura. (8)
  24. 53. Sounds like we'll have to confirm if you're from here, probably a bohemian. (7)
  25. 54. On Mars in a weird little city state. (3,6)
Down
  1. 1. We hear this girl's an absolute state in the US. (7)
  2. 2. Curiously Red Liz wasn't completely neutral. (11)
  3. 3. Ok going back so very often initially it's not always recognised. (6)
  4. 4. Chef ran cellar within fine dining hotspot. (6)
  5. 5. Where saunas are at home, it's loud inland. (7)
  6. 6. Our homelands wet weather echo of war that's currently raging. (7)
  7. 7. Famed salad of cheese and olive oil, we hear. (6)
  8. 8. Halt around there - send north, it's full of dykes. (3,11)
  9. 10. Around us, sir - a massive place! (6)
  10. 11. Men note strange backwards organisation of last to leave Yugoslavia. (10)
  11. 13. Brief first month following a zebra, nearly, I think it might be Europe's most muslim. (10)
  12. 15. A hollow lady follows it looking like a boot. (5)
  13. 17. Without the French returning Down Under for some coffee and waltzing. (7)
  14. 18. Ten back me and lob guru around this tiny but richest of lands. (10)
  15. 20. I re-organised a banal King Zog's country. (7)
  16. 22. Left within sand surrounding cot struggling to be free. (8)
  17. 23. Very dull and efficient grey man is disorganised! (7)
  18. 26. South-west paradise, perhaps for flatpack furniture. (6)
  19. 31. Big town following sales tax I can see is for Catholics. (7,4)
  20. 32. Home of first lady Ian loves gets restructured. (8)
  21. 34. Principality and or royal academy. (7)
  22. 37. Limb energy back in caucus, we hear. (7)
  23. 38. Combined spa in holiday destination (5)
  24. 39. This old ottoman has been gobbled up by the sounds of it! (6)
  25. 41. See **
  26. 42. I following Caesar, perhaps, a gypsy heartland discovered. (7)
  27. 43. Bewildering bears, I will always cause trouble in Sarajevo. (6)
  28. 46. Million on a company, it's some really rich gambling! (6)
  29. 47. Around glen and green, pleasant land! (7)