I am a Vietnamese female PR. I've been in Singapore for over 10 years (studied from secondary school through local university) and am currently a working professional with annual income ~50K. I am also married to a Singaporean.
My Re-entry permit is up for the 1st renewal next year and I am also considering applying for citizenship.
My questions are:
1) My husband will most likely be starting further studies overseas next year, and hence I will be residing overseas with him for 4-6 years. What then will happen when my PR is up for renewal again? The required documents/details for REP renewal comprise residence, employment information and Singaporean spouse's IC. Are these actually the conditions for successful renewal? Basically, does it matter that for my 2nd renewal, I will have been overseas for an extended period and I can only submit my spouse's IC together with my overseas employment details (not sure whether I can even submit this)? My fellow Vietnamese are not having much success applying for PR these days so I can't imagine having to apply again.
2) The above scenario is with the assumption that my citizenship application won't succeed. What are my chances? My income is rather average and again, considering my nationality, I probably will not apply based on my own merit but instead as spouse of a Singaporean. Does that boost my chances or is there no difference? My husband's annual income is currently 85k, does that matter?
Thanks a lot in advance for your advice, both over the years and this time too!

Edited thread title for more clarity.