TASK DEFINITION: In this task, you are given a sentence in English and your task is to translate it into Spanish. In translation, keep the numbers and capitalization (capitalize only the first word of each sentence and name).
PROBLEM: And so it is the "two key" principle that applies here.

SOLUTION: Se aplica por tanto el principio de las dos llaves.

PROBLEM: So I believe the best way to tackle the causes is by ensuring, on the one hand, that good governance is observed in the countries in question and that, on the other hand, there is more supervision nationally and internationally in order to avoid these lapses.

SOLUTION: En resumen, creo que podemos abordar mejor las causas velando, por un lado, por que en los países de los que se trate se respete el buen gobierno y, por otro lado, por que haya más vigilancia nacional e internacional para evitar estas desviaciones.

PROBLEM: There are still, needless to say, many unresolved problems and unanswered questions, also involving the Palestinians.

SOLUTION:
Indudablemente, sigue habiendo muchos problemas no resueltos y preguntas sin respuesta, también con los palestinos.