I began my PhD in October 2016 following my master's degree. I have been progressing quite well in terms of the work but I want to address and take up some other (but related) problems for my PhD. Unfortunately, the curriculum of my PhD is such that I ain't allowed to do what I want to do fully! This makes me dissatisfied at times. I have read several papers in the area of my interest and I always felt that I would be more suited to "that" kind of work instead of the one I am currently doing. Besides, another important aspect is I come from a not very sound financial background. I have to take care of my parents as well with whatever little salary I get as a PhD student (India). Besides, I also need to pay for my Bachelor's educational loan from this money itself.
So the situation right now is as follows--1. I have applied and also received a fully funded PhD offer from a prestigious research group at the University of Oslo in the field of my choice (that I always wanted to work on). This would have immediate positive impact on my personal life because I would be more stable financially (I already how much would it cost and how much I would be paid) and besides I would be happy with my work. 2. This would also mean that I have to speak to my present supervisor about it who doesn't know much details. I have spoken to him about this many times in the past. At least I guess he understands my financial constraints. He himself asked and suggested me to move into jobs (if I get any with my master's) or PhD abroad. But, I guess he never took it very seriously that I would think of leaving one day! Now, I do not know what will be his reaction. He seems to be a nice and friendly guy and quite motivated regarding my work here. However, I do not exactly share his sentiments mainly because of the above two reasons.
I wish I could have put it in a simpler form but I would appreciate if anyone can kindly suggest me what should I say to my advisor? I want to do it as early as possible.
PS- I am from a reputed research institute in India.