Boris Johnson acknowledged on Tuesday that discussions for Sweden and Finland to join NATO would give rise to a "difficult conversation" with Turkey at the summit of the Alliance, welcoming however "progress" .

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“Finland and Sweden, breaking with decades of historical neutrality, now want to join us. It will be a difficult conversation,” the British prime minister told reporters on the plane transporting him to Madrid.

"What matters is that there is progress: the Swedes, in particular, have taken important steps regarding the (Kurdish organizations of) the PKK, the YPG, the issue of particular concern to President Erdogan," he said. he added.

“I think it is very important for our alliance that these two countries are integrated,” he insisted.

In May, the UK signed defense and mutual protection agreements in the event of aggression with Sweden and Finland, without waiting for possible accession.