Which country is the real meddler in others' affairs?

Editor's note: In his recent speech at the Hudson Institute, US Vice-President Mike Pence made groundless accusations against China. Wang Dong and Sun Bingyan, two research fellows on international relations at Peking University, commented in a recent article:

Among all Pence's groundless accusations against China, the most ridiculous one must be China "meddling" in the US midterm elections in a bid to undermine the Donald Trump administration.

Pence gave two justifications for his claim. First, he said that China was intentionally seeking to weaken the support for the Republican Party in the agricultural states of the United States with its tit-for-tat tariffs. Second, he said that China's public diplomacy in the US was trying to influence people to vote against the Republican candidates.