A group of activists poured hundreds of litres of yellow and blue paint onto the road outside the Russian Embassy in London on Thursday to create an enormous Ukrainian flag ahead of the one year anniversary of Moscow's invasion.
The campaign group "Led By Donkeys" halted traffic before spreading more than 300 litres of paint across the road using wheelbarrows and brushes to make the 500 square metre (5382 square feet) flag.
"Ukraine is an independent state and a people with every right to self-determination," the group said in a statement.
"The existence of a massive Ukrainian flag outside (Russian President Vladimir Putin's) embassy in London will serve to remind him of that."
Moscow says its invasion was justified by concerns about its security.
London's Metropolitan Police said three men and one woman had been arrested on suspicion of criminal damage and obstructing the highway.
The tyres of several vehicles were covered in the paint as they drove over it, leaving colorful markings along the road which borders Hyde Park and Kensington Gardens.
The group said the non-toxic, solvent-free and fast-dry edible paint was washable and designed for road art.
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