Support for sanctions across Europe is high at present.
However public sentiment will likely change rapidly if the lights start going out in Germany and Italy (main users of Russian gas) + other smaller users.
Building the capability to replace these supplies will take years. Germany needs to build new gas terminals. Nuclear power stations and wind farms are heavy engineering. Reverting to coal is more likely (mothballed capacity??) but environmentally unattractive.
The ability of Russia to wage war over the next few months will be largely unaffected by sanctions unless they encourage the Russian public or cronies to solve the Putin problem.
Even assuming the EU bans import of Russian gas, it may not seriously impact Russia - there are plenty of other countries which would buy - India, China, Pakistan, Bangladesh.
Conclusion - the £1bn/£35bn sound bite is superficially convincing but does not stand scrutiny.
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