The BBC, anglo media in general, has been very bad at reporting this. The summit is not about Ukraine, the summit is about security in Europe. Yes, the war in Ukraine will be a big part of that, but the core discussions will be around European budget rules, common debt and defence spending.
I'd also ignore everything the BBC says about Starmer's role in the conversation. He'll be marginal, this will mainly be decided by Germany and France, not the UK.
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https://www.bbc.com/news/articles/c04nw1pg3k2o