Closeness centrality of a country is the average distance from this country to all the other countries in
the complex network. It reflects the anti-control ability of a country. The closer a country is from others,
the higher anti-control ability. Fig.3 shows the closeness centralities of five countries. From Fig.3 we can
see that the anti-control abilities of USA and Russia are similar and both are higher than other countries.
The anti-control ability of China is between Netherlands and Japan, and it is ascending slightly.