1) United States, Donald Trump
2) Russia, Vladimir Putin
3) India, Ram Nath Kovind
4) China, Xi Jinping
Explanation:
On July 1, 2019, US (United States) President Donald Trump became the first sitting president to enter North Korea after briefly crossed the border in the demilitarised zone (DMZ) between South and North Korea. He met North Korea’s leader Kim Jong Un and agreed to resume stalled nuclear talks. Third meeting: This was their third meeting in just over a year on the old Cold War frontier that for decades has symbolized the hostility between their countries, which are technically still at war.Background: They met for the first time in Singapore in June 2018 and second time in Hanoi, Vietnam in February 2019 to improve relations and work towards the denuclearisation of the Korean peninsula.