The European Commission will propose on Tuesday ways for the European Union to boost its arms industry so it can shift to “war economy mode” in response to Russia’s invasion of Ukraine. Thierry Breton, the European industry commissioner, will lay out proposals to encourage EU countries to buy more weapons together from European companies, and to help such firms increase production capacity, according to EU officials. “We need to change the paradigm and move into war economy mode. This also means that the European defense industry must take more risks, with our support,” said Breton, previewing the package. Breton, a...