Article 6(1) of Council Regulation (EC) No 44/2001 of 22 December 2000 on jurisdiction and the recognition and enforcement of judgments in civil and commercial matters must be interpreted as meaning that, in a situation such as that in the main proceedings, that provision may be relied on in the context of an action brought in a Member State against a defendant domiciled in that State and a co-defendant domiciled in another Member State even when that action is regarded under a national provision as inadmissible from the time it is brought in relation to the first defendant.