it is to be noted that citizens of member countries should not promote or support groups or political parties of their home countries while they are in another member country

it is noted at the 2018 Malaysian election

the singapore police has stated the following clearly

Foreigners visiting, working or living in Singapore should not use Singapore as a platform to further their political causes.

note singapore is not the place for people of other countries to hide and use as a platform in order to achieve changes in constitution or political goals which they may have for their home country.

it is non interference principle of asean

The principle of non-interference is the original core foundation upon which regional relations between ASEAN member-states are based (Keling et al. 2011). The principle was first lined out in ASEAN’s foundation document, the Bangkok Declaration, issued in 1967. The Bangkok Declaration expressed that the member-states are determined to prevent external interference in order to ensure domestic and regional stability (Stubbs 2008). The non-interference policy was reiterated in the Kuala Lumpur Declaration of 1997 (Keling et al. 2011). It was further reinforced in the 1976 Treaty of Amity and Cooperation in Southeast Asia (TAC), in which the principle of non-interference in members’ internal affairs was explicitly referred to as one of the association’s fundamental principles (Stubbs 2008).

To understand ASEAN’s guiding principle of non-interference, it is important to clarify its meaning. While the principle of non-interference is adopted by many organizations throughout the world and is enshrined in the Charter of the UN, what appears to be unique to ASEAN’s conduct of regional relations is therefore not merely the adoption of non-interference as a behavioural norm, but rather its particular understanding and subsequent practices of this norm (Katsumata 2003). As Bellamy and Drummond (2011 p.185) state: “Despite the fact that the Association has made no attempt to define what it means by ‘interference’, regional practice prior to the mid 1990s suggests that it was construed as a continuum of involvement in the domestic affairs of states that ranged from the mildest of political commentary through to coercive military intervention”. This broad interpretation led the non-interference policy function as an arrangement for the prevention of any acts by ASEAN member-states that would possibly undermine the authority of the dominant political elite and upset domestic governance in any of the member-states (Ruland 2011). The non-interference norm should therefore not be regarded merely as an ideal, but also as a political tool (Nesadurai 2009).