He is pointing at a TV.
Xi Jinping and Putin taking the high-speed rail to Tianjin, China in 2018-06-08, during Putin’s visit.
Video: https://baijiahao.baidu.com/s?id=1602713068773632490
Putin’s China trip: High-speed train, ice hockey, local snacks https://www.chinadaily.com.cn/a/201806/09/WS5b1b6670a31001b82571f152.html
Comrades, I have made a mistake, the video from China Daily loaded on mobile and I see that he is actually pointing at the speed display above the carriage door, saying that the train was moving at 300 kph.
I shall now see myself to the gulags in shame.