Combine harvesters work in a field in Ukraine’s Kharkiv region amid Russia’s invasion, with the country remaining a major global supplier of maize, wheat and barley. (EPA Images pic)STRASBOURG: Intensified Russian attacks in the Black Sea targeting Ukraine's grain exports are worsening a "perfect storm" facing global food supplies, the EU's top diplomat said Tuesday.

"Six attacks in 10 days by suspected Russian drones marks a dangerous and unacceptable escalation in the Black Sea," EU foreign policy chief Kaja Kallas told the European Parliament.

The string of attacks on civilian vessels off the coasts of EU and Nato members Romania and Bulgaria in recent weeks have stirred condemnation and concern in Europe.