For a sound definition, answering the following three questions will be a guide:
If regional states or non-state actors follow a policy to protect communities sharing the same, or similar, sectarian sensitivities, can this possibly be evaluated as an indicator of sectarian politics?
If these actors take advantage of the same, or similar sectarian sensitivities of other peoples in other countries to serve their own interests, does that amount to following sectarian politics?
If these regional actors try to spread their own sectarian identities among Muslims of other countries (Shi’ization, Salafization, or Sunnization), can this be considered sectarian politics?
All of the attitudes and actions represented in the questions above can be indicators of sectarian politics, although to different degrees.