MOSCOW, Jan 11 (Reuters) - A senior ally of President Vladimir Putin warned on Thursday that any Ukrainian attacks on missile launch sites inside Russia with arms supplied by the United States and its allies would risk a nuclear response from Moscow.
https://en.wikipedia.org/wiki/Red_lines_in_the_Russo-Ukrainian_War
If this new one qualifies as an official “red line” statement – and I don’t think it does – then it’d be about 40.