Israel unleashed airstrikes across Iran for a third day on Sunday and threatened even greater force as some Iranian missiles evaded Israeli air defenses to strike buildings in the heart of the country.

Iranian media reported that Israel struck the South Pars Gas Field in what would be the first attack on an Iranian energy site.

Israeli emergency services have said at least two people were killed in the strikes and dozens of people are injured.

Russia has maintained a delicate balancing act in the Middle East for decades, trying to navigate its warm relations with Israel even as it has developed strong economic and military ties with Iran.