I believe that a strong national currency is an obligatory factor which ensures stability and safety of investments. But, however, its incredibly unstable in some developing countries. How are you going to find a compromise?
If you consider it to be a problem, consider it to be a bunch of opportunities. For example, you can follow the trends of development of the national currency and find the most appropriate time for investment.
Yes, of course, you can act like this, but no one can guarantee that there wont be an even more profitable moment in the near future and the value of the asset wont reduce even more.