Socialist Prime Minister Pedro Sánchez signed a security deal with Ukraine’s President Volodymyr Zelensky on Monday in Madrid which includes a commitment to provide military support to Kyiv worth €1 billion this year.

The Spanish prime minister said this would allow “Ukraine to boost its capabilities including its essential air defence systems to protect its civilians, cities and infrastructure”.

But Labour Minister Yolanda Díaz – the leader of far-left party Sumar, the junior partners in Sanchez’s coalition government – criticised the amount.

“These are very high sums,” she told Spanish public television TVE, accusing Sánchez’s Socialist party of a “lack of transparency”.

“We learned yesterday from the press that this billion euros was intended for arms for Ukraine,” added Díaz, one of three deputy prime ministers.

“Defence policy is very important for the country, and the people have a right to a public debate.”

The aid package was approved by Spain’s parliament but without specifying who the recipient would be, according to Spanish press reports.

Sánchez’s Socialists and Sumar have clashed frequently over foreign policy since they formed their coalition government in 2020, with the far left party highly critical of arms shipments to Ukraine.

According to the Kiel Institute — which tracks weapons pledged and delivered to Ukraine since the Russian invasion — Spain has so far committed €330 million in military aid, making it a small contributor on a European level.

By comparison, Berlin, Paris and Rome have committed €18.61 billion, €5.65 billion and €1.0 billion respectively, while London’s contribution stands at 9.22 billion, the figures show.