Russian President Vladimir Putin hosted his Chinese counterpart Xi Jinping for two days of talks this week, with the leaders signing a joint statement pledging to deepen their strategic partnership -- and affirming Russia's support for China on Taiwan.

Beijing views the self-ruled and democratic island as its territory, to be retaken one day -- by force, if necessary.

"The Ministry of Foreign Affairs solemnly protests and strongly condemns (China's) authoritarian expansionist government for continuing to issue false statements in the international arena to belittle and damage our country's sovereignty," said the Taiwanese statement.

It also condemned "Russia's attempt to sing and dance to China's tune for its conspiracy of aggression and expansion".

In the joint statement, Russia had reaffirmed its adherence to Beijing's "One China" principle, terming Taiwan "an inalienable part of Chinese territory", according to the Chinese state-run Xinhua news agency.

"(Russia) opposes any form of 'Taiwan independence', and firmly supports China's measures to safeguard its sovereignty and territorial integrity," Xinhua reported the statement as saying.

Taiwan lives under constant threat of military action by China, and Russia's invasion of Ukraine has deepened fear on the island that Beijing might attempt something similar.

Beijing has ramped up military, economic, and diplomatic pressure on Taiwan in recent years, staging massive military drills around the island last year that Taipei said were preparing for an invasion.