Russia is once again waving around its nuclear weapons. Last week, Vladimir Putin warned Nato countries against allowing Ukraine to use western munitions to strike Russia. The Russian leader warned of “serious consequences” and said that Ukraine’s allies should be aware of the “small territory” and “dense population” of many European countries.

In case this was too vague, Dmitry Medvedev followed up with a more blood-curdling threat. Russia’s former president cited Putin’s words and added: “The use of tactical nuclear weapons can also be miscalculated. This would be a fatal mistake.”

Medvedev has a reputation as a man who is fond of strong drink. But Moscow has also taken actions recently to underline its threats, with Russian troops conducting nuclear drills near the border with Ukraine.