German Chancellor Olaf Scholz welcomed the leaders of the US and China sending a clear message about the use of nuclear weapons, calling the threat a “red line” that must never be touched. US President Joe Biden and Chinese President Xi Jinping agreed at their hotly anticipated one-on-one talks in Bali on Monday that a “nuclear war should never be fought,” including in Ukraine, according to the White House. China’s stance was seen as a rebuke to Russian President Vladimir Putin from a key ally. Putin and the Kremlin have at times hinted at the notion of using such weapons for defensive purpose…