A partition extracurricular the gathering successful Nine Elms was seen partially covered with orangish overgarment aft the stunt astatine astir 9.20am connected Wednesday.
Just Stop Oil released video of 2 activists spraying the partition arsenic good arsenic pictures of 2 men being spoken to by constabulary officers.
The Metropolitan Police said 2 men, aged 25 and 72, had been arrested connected suspicion of transgression harm and held successful custody.
Deputy Assistant Commissioner Andy Valentine said: "Officers from the Parliamentary and Diplomatic Protection Unit arrested these 2 men wrong minutes, ensuring that they could not origin immoderate further harm to the embassy.
"This enactment is vandalism purporting arsenic protestation and we volition proceed to person a zero tolerance cognition to actions specified arsenic this."
Just Stop Oil supporters were arrested aft the US Embassy successful London was sprayed with paint
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The biology activists accidental they are demanding governments enactment unneurotic to “end the extraction and burning of oil, state and ember by 2030”.
A spokesperson said: “The lone existent victor of today’s predetermination is the firm powerfulness that controls the large parties successful some the US and UK.
“Regardless of who sits successful the White House, corporations and billionaires volition guarantee that the interests of the fossil substance manufacture volition proceed to beryllium prioritised implicit the wellbeing of mean people.
“It is lone done radical coming unneurotic to disrupt ‘business arsenic usual’ that humanity volition basal immoderate accidental of minimising the effects of clime breakdown, and the resulting societal illness that is already nether way.”
Police branded the stunt “vandalism purporting arsenic protest”
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They added: “As agelong arsenic ideology is hijacked by firm interests and billionaires, it volition neglect to present the alteration mean radical are crying retired for.
“This volition ever permission the doorway unfastened for fake populists similar Trump to exploit the disaffection galore feel.
“Ordinary radical person to measurement up, get organised and marque alteration happen, due to the fact that it should beryllium wide by present – nary governmental leaders are coming to prevention us.”
It came aft Mr Trump declared helium had won a “magnificent triumph for the American people”.