Russian President Vladimir Putin arrived in Beijing on Tuesday night for a two-day state visit to China, marking his 25th trip to the country since assuming the presidential office in 2000.

Prior to his departure, Putin delivered a video address in which he said, "I'm delighted to be visiting Beijing once again at the invitation of my longtime good friend, the President of the People's Republic of China, Xi Jinping."

On Sunday, both Xi and Putin sent congratulatory letters to the 10th China-Russia Expo, which opened on the same day in Harbin, the capital of Northeast China's Heilongjiang province.

Russia's TASS news agency quoted Putin as saying in his video address that regular mutual visits and Russia-China top-level talks "are an important and integral part of our joint efforts to promote the entire range of relations between our two countries and unlock their truly limitless potential".

Bilateral relations today "have reached a truly unprecedented level", Putin said.

The special nature of the ties "is reflected in the atmosphere of mutual understanding and trust, in the commitment to pursuing win-win and equitable cooperation, in conducting respectful dialogue, and in supporting each other on matters affecting the core interests of both countries, including protection of sovereignty and state unity", he added.