Slight correction here. Kissinger didn't persue China to open up another front against USSR. He did it, because the entire west was unaware of the Sino-Soviet split and they viewed the China+USSR combination as an unbeatable & even bigger ( in every sense- population, resources, land area, etc) version of the US-Canada-Europe economic-political union.To prevent the spread of communism.
Contrary to the general impression people have of him he's served his adopted country loyally working well within the constraints of the times & accepted policies of the day , in accordance with the wishes of the administration he was a part of , which he was instrumental in framing but not exclusively so , be it in the ME , Africa , Asia Latin America Europe or the ex USSR.
Where he erred grievously was in his understanding of China , the tactical decision to rehabilitate China which was a pariah state in the early 1970s on the brink of implosion by pursuing close relations with it only to open up another front against the former USSR & being blinded to their obvious ambitions which became apparent much later , after he demitted office & which was at complete variance to the interests of the US , working as an elder statesman particularly at the behest of Republican administrations , though not exclusively so , often pleading China's case in Washington among his successors & admirers in the state department with various administrations , where he enjoyed bi partisan support & tremendous respect for his insights & views particularly on China.
He didn't course correct even after the error of his ways became apparent . How much of it was being blindsided by his views on China , how much of it was his ego at play refusing to see things as they are as opposed to what they were when he first made his clandestine trip to China , for he in partnership with Nixon inaugurated a new era in international diplomacy by normalising relations with China which at the time was hailed as a masterstroke of diplomacy , is something we'd never know & can only speculate.
HE remained adamant till the very end disavowing confrontation with China, instead advocating a G2 mechanism where China would share power as an equal with the US which almost became policy under the most overrated president of the US in modern times - Obummer before it ran aground in Obummer's tenure itself & was finally buried under Trump.
Generations from now will recognise the vital role the Trump administration played in ending BAU - business as usual with China which a black swan event like the Wuhan virus pandemic vindicated forcing his successor "China" Joe Biden to pursue a continuation in hostile policies
against China though he's tried to temper as many of these policies as he can , as opposed to Biden's earlier stance of accommodation of China during his tenure of a VP in Obummer's administration .
Many in the US suspect his earlier molly cuddling of China & present soft stance in some issues as opposed to pursuing a more robust & hostile FP which had Trump been re elected , he'd definitely have pursued , was also in great part due to his prodigal son's business dealings with China .
Meanwhile Kissinger's legacy lies in tatters given the present state of disrepair in the relationship between US & China . As & when the 2 go to war , which they will eventually , his legacy will be effectively buried for he'd go down in history as being instrumental in creating a Frankenstein to rival his own country being probably the only man to do so in the recorded history of international diplomacy , though he wasn't alone in this endeavour but the most prominent among such people.
What a cross to bear for a person so brilliant in his chosen vocation being one of its most astute & acclaimed practitioner ! Verily self deception can cloud the intellectual faculties of the most brilliant of people.
Kissinger viewed- correctly within his assumptions(of no Sino-Soviet split) that its a matter of time before the Soviet-Chinese alliance relegates the Anglo-Saxon-Germanic alliance into second class status.
The lunacy/retardation of the western establishment (of which Kissinger was a part) was to think that economic progress would bring political freedom & gradual re-alignment towards democratic principles: as if it ever happened in the oil rich middle east or as if China ever had a problem being rich & autocratic throughout the ages.