South Korea's credit default risk has plunged to a more than ten-year low on a much-awaited trade deal between the US and China and the outcome of the British election, which effectively green lights the United Kingdom's exit from the European Union, the finance ministry said Wednesday.

The credit default swap premium for South Korean foreign exchange stabilization bonds with a five-year maturity came to 22.2 basis points, marking the lowest since the 22.1 basis points recorded on Oct. 15, 2007.

The spread reflects the cost of hedging credit risks on corporate or sovereign debt. A fall implies an improvement in the credit of government bonds and lower costs for issuance. A basis point is 0.01 percentage point.

US President Donald Trump has signed a phase-one trade deal with China that averted steep tariffs planned by the US against Chinese goods.

The protracted trade row between the US and China, the two largest trading partners of South Korea, has weighed on Korean exports.

British Prime Minister Boris Johnson's party won a landslide electoral victory last week, endorsing Britain's exit from the European Union by Jan. 31 next year, easing uncertainties over the so-called Brexit impasse. (Yonhap)