When you are an international investor you have to follow closely the news worldwide and let's face it it is not always an easy task. It can quickly become too much work for an individual investor. Let’s look at the potential US sanctions on Iran for instance. It can have impact on many oil companies including in Vietnam. These sanctions can impact oil prices and consequently have a large impact on Oil companies such as PetroVietnam. It can also impact other sectors of the economy and some stocks may be impacted.