If you want to apply conditional validation on 'Second Country Latitude' or 'Third Country Latitude', then you need to add 'Continent' input as 'Asia'.
{{countryForm.controls?.continent?.errors?.latitude.message}}
If you want to apply conditional validation on 'Third Country Latitude' then you need to add 'Continent' input as 'Asia'.
Conditional Expression with type 'string'
{{countryForm.controls?.thirdCountryLatitude?.errors?.latitude.message}}