Hundreds of PSS agents blockaded the presidential compound and thwarted investigators from trying to arrest Yoon. The investigators were pulled back because of the risk of a clash.
Officials of the Corruption Investigation Office for High-ranking Officials (CIO), which is leading the investigation, have said PSS agents were carrying firearms during the standoff although no weapons were drawn.
The investigators obtained a new arrest warrant this week after Yoon defied repeated summons to appear for questioning.
On Thursday, lawyers for Yoon said the arrest warrant was illegal and invalid.
Yoon is under a separate Constitutional Court trial reviewing parliament’s impeachment of him on Dec 14 to decide whether to remove him from office permanently or reinstate him. His lawyers have said Yoon will accept that verdict.
As Yoon awaits his fate, holed up inside his hillside residence, polls released this week showed a revival of support for his ruling People Power Party (PPP) and calls for his permanent removal slipping.
A Gallup Korea survey published on Friday showed 64 per cent of respondents back Yoon’s removal from office, compared to 75 per cent who favoured it soon after the martial law declaration.
The PPP’s approval rating rose to 34 per cent, a level similar to the period before Dec 3, in the poll of 1,004 people this week, from 24 per cent about a month ago.
Analysts said the prolonged uncertainty over Yoon’s fate has not only emboldened his supporters but softened some critics concerned that the liberal opposition Democratic Party leader, who is himself on trial on allegations of criminal wrongdoings, may become president.