Now that the ATACMS have been delivered, and nuclear war is inevitable, let's go through some of the red lines Russia has drawn so far:

Dec 2021: No weapons from the West to Ukraine
Feb 2022: No Western "interference" in Ukraine
Mar 2022: No more Western weapons to Ukraine
Mar 2022: No MIGs to Ukraine
Jun 2022: No long range missiles to Ukraine
Aug 2022: No supplying of old Soviet tanks to Ukraine
Sep 2022: Aid by Germany "crossed a red line"
Sep 2022: No longer range missiles than HIMARS to Ukraine
Nov 2022: No Patriot systems to Ukraine
Jan 2023: No modern Western tanks to Ukraine
May 2023: No F-16s to Ukraine
Sep 2023: No ATACMS to Ukraine

To conclude: they're bluffing, send everything Ukraine needs to win the war against Russia.
wouter