Not sure what you mean by "catastrophic" but for example last year some parts of Siberia had +5ºC on average during summer.

https://www.theguardian.com/environment/2020/jul/15/climate-...

This is not new and is getting worse.

In 2010, Russian wildfires severely impacted the worldwide price of grain which (some people argue) helped trigger the Arab spring revolts.

https://en.wikipedia.org/wiki/2010_Russian_wildfires

https://www.americanprogress.org/issues/security/reports/201...