Russia is the main investor in the Republic of Moldova.
This pro-Kremlin narrative aims to show Moldova as a country dependant on Russia. This type of narrative is used in reference to other countries, too - see a similar example here.
According to the Moldova State News Agency, in 2018, more than 80% of foreign direct investments were drawn to Moldova from the European Union. Investors from the Commonwealth of Independent States countries accounted for 6% of the accumulated capital.
Read a similar case about Moldovan imports from the EU here.