Police in Spain arrested 30 people on suspicion of smuggling cannabis disguised as aid for Ukraine.
Those detained in Andalusia included Ukrainians, Spaniards, Germans, and Moroccans.
According to police, the drugs originated in the southern region, were packaged in cardboard boxes, and were transported in convoys across several countries.
The seizure comes just a month after Spanish authorities announced the largest cannabis haul ever discovered in the country.
The Guardia Civil police force said in a statement on Monday that they became suspicious after identifying a group of Ukrainians on the Costa del Sol collecting cannabis and storing it in a flat in Mijas, near Malaga.
The drugs were packed in vacuum bags and placed in cardboard boxes on vans registered in Ukraine, which proceeded to travel “as a solidarity convoy so they could pass under the radar of police and border controls”, it said.
In raids in Malaga province and in the southern cities of Granada, Cordoba and Seville, police seized nearly €800,000 (£690,000; $847,000), six guns and 2,500 cannabis plants.
Thousands of people across Europe have been involved in efforts to alleviate the suffering of Ukrainian civilians since Russia launched an invasion of its neighbour on 24 February.