The Georgian Foreign Ministry informed about the journalist's detention, without disclosing his name.
"On August 7, 2018, during the ongoing Victima exhibition in the UK, dedicated to the 10th anniversary of the August War, a stranger broke into the Embassy building, behaving aggressively. He filmed the exhibition without permission, loudly chanted slogans against NATO, and accused Georgia of providing the UK audience with incorrect information," the ministry said in a statement.
The ministry added that an investigation into the case was launched.
"The diplomatic police, who were called on the spot, acted quickly and detained Graham Phillips," Georgian Ambassador Beruchashvili told reporters.
Russia sent troops to the republics in an attempt to protect local residents, many of whom were Russian nationals. After five days of hostilities, Russia managed to expel Georgian troops from the region, securing South Ossetia and Abkhazia.