I think its a special Chinese E-Class Model. Possibly modified for diplomats.
>China-Exclusive Mercedes-Benz E-Class L Has Longer Wheelbase than Standard S-Class
>Whether it's executive sedans or even smaller sedans and SUVs, an increasing number of vehicles are offered in China with a long-wheelbase variant. The all-new Mercedes-Benz E-Class makes no exception, which is not surprising given that its predecessor was offered with a stretched wheelbase as well. Debuting at Auto China 2016 in Beijing, the new E-Class L is tailor-made for the Chinese market.
>Built in China for China, the E-Class L features…
https://drivemag.com/news/china-exclusive-mercedes-benz-e-class-l-has-longer-wheelbase-than-standard-s-class
https://en.wikipedia.org/wiki/File:Mercedes_E-Class_V213_02_China_2017-03-30.jpg