Lavrov told NBC that a group including Security Council members should guarantee Ukraine's security.
Authorities said investigations are underway to determine the exact cause of the accident.
In 2006, MTN was chosen over Turkcell to become the 49 percent minority shareholder in Iranian government-controlled mobile phone carrier Irancell.
The detainee admitted to his actions during interrogation, expressing deep regret and describing his behavior as the result of ignorance.
"As of August 18, 20 people died as a result of the emergency incident," the local emergency service headquarters said in a post on Telegram.
Balochistan, Pakistan’s largest but least populated province, has been a focal point of unrest for decades, with separatist violence and militancy undermining development and security.
Russia currently occupies about a fifth of Ukrainian territory, while Ukraine holds barely any Russian territory.