Ignacio Ibanez, the director general for foreign affairs at Spain's foreign ministry, told BBC Radio 4's PM his country was "not worried" about the UK's consideration of legal action against Spain over the additional border checks on Gibraltar.
Legal advice is a normal part of the work.
We are not worried because we are convinced about what we are doing and we know that the right is on our side.
He added that it was "normal" that Spain would talk with Argentina about Gibraltar and the Falklands.
It may be a pre-planned training exercise but what timing: UK warships sail through disputed water to Her Majesty's naval base on Gibraltar.
Spain could damage to the economy in Gibraltar, but in doing so it would harm its own, so a further escalation of threats is unlikely.
The PM has said he is seriously concerned by Spain's plans to introduce a levy at the border with Gibraltar.