According to recent reports, the Chinese government has made clear to Moscow that certain limits in the Ukraine war must not be crossed.
The alleged red line reportedly concerns the possible use of nuclear weapons.
The warning aims, according to sources, to prevent further escalation of the conflict and to maintain regional stability.
Ukrainian officials, including President Volodymyr Zelenskyy, have reportedly spoken of an ultimatum and stressed that nuclear weapons must not be used.
Observers see China's move as an attempt to assert its influence while avoiding a broader international confrontation.