South Africa’s president said Tuesday that arresting Russian President Vladimir Putin — should he show up at an economic summit next month in Johannesburg — would amount to a “declaration of war” by his country.

The August summit is bringing together Brazil, Russia, India, China and South Africa — a bloc of developing economies known as Brics. Officials have said that Putin wants to attend the gathering but have been trying to persuade him to stay away to avoid the legal and diplomatic fallout over his international arrest warrant.

The warrant, by the International Criminal Court, relates to alleged war crimes during Russia’s invasion of Ukraine. As a signatory to the Rome Statute that established the ICC, South Africa would be obligated to arrest Putin if he visits the African nation.

South Africa’s biggest political opposition party, the Democratic Alliance, has tried to compel President Cyril Ramaphosa’s government to pledge to arrest Putin in an action before the High Court in Pretoria.

But in a strongly worded affidavit to the court, made public on Tuesday, Ramaphosa reiterated that such an action against Putin could also derail any efforts to end the war in Ukraine.

“I must highlight, for the sake of transparency, that South Africa has obvious problems with executing a request to arrest and surrender President Putin,” he said. “Russia has made it clear that arresting its sitting president would be a declaration of war.”

“It would be inconsistent with our Constitution to risk engaging in war with Russia,” Ramaphosa added.

The dilemma on the ICC warrant for Putin follows diplomatic tensions with the West over South Africa’s stance on Russia’s invasion of Ukraine. South Africa has consistently abstained from voting at the United Nations to condemn Russia’s aggression, calling instead for dialogue to end the war.

South Africa is also part of efforts by a group of at least six African nations who recently embarked on a peace mission to Kyiv and Moscow to meet Putin and Ukrainian President Volodymyr Zelenskyy.

“An arrest of President Putin would introduce a new complication that would foreclose any peaceful solution” to the conflict,” Ramaphosa said in the affidavit, submitted last month.

Ramaphosa had insisted that the affidavit remain confidential but the court ruled on Tuesday it can be made public.

The South African leader had earlier said that an announcement about Putin’s possible participation at the August 22-24 summit would be made soon.