"The region is quieter than it has been for decades," Sullivan said in the original essay as quoted by media on Wednesday.
"The progress is fragile, to be sure. But it is also not an accident... [Biden's] approach returns discipline to US policy. It emphasizes deterring aggression, de-escalating conflicts, and integrating the region."
According to the report, Sullivan also claimed that although the Palestine-Israel conflict remains tense, the Biden administration de-escalated the crisis in the Gaza Strip and restored diplomatic ties between the two parties.
Sullivan also said US troops were no longer regularly attacked in Iraq and Syria, adding that the peace in the Middle East was a result of military action combined with diplomacy to deter Iran's influence in the region.
Sullivan had already been publicly scrutinized for claiming the Middle East had become more stabilized days before Hamas carried out attacks against Israel on October 7, which led to Israel declaring war on the Palestinian movement. Some 1,200 Israeli soldiers and civilians have died and some 6,000 Palestinians with multiple thousands of wounded since October 7.