North Korean leader Kim Jong Un was spending his birthday in Beijing after arriving in the Chinese capital Tuesday — which was believed to be his 35th birthday — for his fourth summit with Chinese President Xi Jinping as talks on a second meeting with U.S. President Donald Trump gather steam.

"At the invitation of Xi Jinping, general secretary of the Central Committee of the Communist Party of China and Chinese president, Kim Jong Un, chairman of the Workers' Party of Korea and chairman of the State Affairs Commission of the Democratic People's Republic of Korea, is visiting China," the official Xinhua News Agency quoted an unidentified spokesperson from the Chinese Communist Party's Central Committee International Department as saying Tuesday.

Kim was to visit through Thursday, the spokesperson said.