People walk past a mural depicting U.S. presidential candidate Donald Trump and former London mayor Boris Johnson kissing, in Bristol, England. (Ben Birchall/Press Association via AP)

A painting that depicts U.S. presidential candidate Donald Trump kissing former London mayor Boris Johnson on the lips has appeared on an abandoned building in Bristol, Britain.

The painting carries a message asking potential voters to register for the June vote on whether Britain should leave or remain in the European Union, a hot-button issue in which both Trump and Johnson have come out against the bloc.

The group behind the mural posted an Instagram photo with a caption explaining the message behind the mural, which is named the "Kiss of Death."

The painting seems inspired by a recent mural on a restaurant in Vilnius, Lithuania, of Trump and Russian President Vladimir Putin embracing. The artists warned that Trump, who has made a number of comments in support of Putin, was worryingly similar to the Russian leader.

“We are in a sort of Cold War again, and America may get a president who will want to be friends with Russia," Dominykas Ceckauskas, owner of the restaurant, told the Baltic News Service.

People walk past a mural on a restaurant wall in Lithuania depicting Donald Trump and Russian President Vladimir Putin kissing. (Petras Malukas/AFP)

That painting was inspired by a famous 1979 photograph that showed Soviet leader Leonid Brezhnev and East German President Erich Honecker kissing each other on the lips (once a form of fraternal greeting between socialist leaders). That iconic image was later painted onto the Berlin Wall in 1990, further adding to its notoriety.

A tourist walks past the graffiti-covered mural painting called "My God, Help Me to Survive This Deadly Love" by Russian painter Dmitri Vrubel , depicting the kiss between then-Soviet leader Leonid Brezhnev (L) and East German leader Erich Honecker at the East Side Gallery. (John MacDougall/AFP)

Trump and Johnson are both brash, right-wing politicians known for their controversies and their untamed blond hair. Johnson, a member of Parliament who was until recently the mayor of London, has become the highest profile British politician to throw his weight behind a British exit of the European Union.

Meanwhile, Trump — who has already ignited a feud with Boris's successor, Mayor Sadiq Khan — has also expressed his support for a "Brexit." He has chided President Obama for stepping into the debate (again, something Johnson has also done).

Despite the embrace depicted in the mural in Bristol, it's unclear how close Johnson and Trump really are.

"The only reason I wouldn't visit some parts of New York is the real risk of meeting Donald Trump," Johnson said in December after Trump proposed a ban on Muslim arrivals to the United States.

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