Chinese ratings agency Dagong announced on Tuesday that it decided to keep UK's sovereign credit ratings unchanged at A plus, as well as the outlook as stable.

Dagong ratings said that Brexit will slow down UK's economy in the short term. But in the long run, the country's competitive advantage and indepedent policy will help its credit rating.

But the agency warned that it will keep a close eye on Brexit's spillover effect around the world. Earlier this week, three international rating agencies, S&P's, Fitch and Moody's all downgraded the UK's sovereign credit ratings.