Northern Ireland protocol: how might EU respond to UK plans?

What options are open to EU as Britain publishes bill detailing plans to override parts of protocol?

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The EU has vowed to use all measures at its disposal" in response to the government bill that would unilaterally override parts of the Northern Ireland protocol - a step Brussels, and many on Conservative backbenchers, see as a flagrant breach of international law.

While the threat of an economically damaging trade war has captured the headlines, it will not be the EU's first move.