June 22 (UPI) -- In the wake of President Donald Trump's strike on Iran's nuclear sites Saturday, former Russian President Dmitry Medvedev said Sunday that "a number of countries" are ready to directly supply Iran with their own nuclear weapons.

Gen. Dan Caine said at a Pentagon press conference Sunday that measuring the damage at the sites would take time but that an initial assessment indicates that all three sites sustained "severe damage and destruction." He revealed that the mission involved 75 precision-guided munitions, including 14 GBU-57 bunker-busters.

"Do you remember that the operation was beginning, I promised you that Iran's nuclear facilities would be destroyed, one way or another. This promise is kept," Israeli Prime Minister Benjamin Netanyahu said on social media, revealing that the strike was carried out by the United States in "full coordination" with the Israeli Defense Forces.

While Israeli and American authorities have indicated major damage at Fordow, Natanz and Esfahan, Iranian and Russian authorities have indicated only minor damage to Iran's capabilities for nuclear enrichment.

"What have the Americans accomplished with their nighttime strikes on three nuclear sites in Iran?" Medvedev questioned in a post on social media. "The enrichment of nuclear material -- and, now we can say it outright, the future production of nuclear weapons -- will continue. A number of countries are ready to directly supply Iran with their own nuclear warheads."

Medvedev said Iran's political leadership has survived despite Israel's apparent pursuit of a regime change and may have "come out even stronger."

Like Russia, Iran ally Pakistan is armed with nuclear weapons but said Thursday that it had not yet received requests for any military assistance from Iran while expressing alignment with its neighbor. It has since condemned the U.S. attack on Iran.

"The unprecedented escalation of tension and violence, owing to ongoing aggression against Iran, is deeply disturbing. Any further escalation of tensions will have severely damaging implications for the region and beyond," Pakistan's Foreign Ministry said in a statement Sunday.

Sa'eed Iravani, Iran's ambassador and permanent representative to the United Nations in New York, has called for an emergency meeting of the U.N. Security Council, Iranian state media reported Sunday. Iran is calling for the Security Council to rebuke the United States, which is a permanent member of the UNSC.

The Russian Foreign Ministry also released a statement condemning the strike on Iran's nuclear facilities, calling them a violation of international law and the United Nations charter. It called the attack a "substantial blow to the global non-proliferation regime built around the Treaty on the Non-Proliferation of Nuclear Weapons."

"They have significantly undermined both the credibility of the NPT and the integrity of the International Atomic Energy Agency's (IAEA) monitoring and verification mechanisms that underpin it," the Russian Foreign Ministry said.

China's Foreign Ministry likewise said the United States had violated the U.N. charter and international law as it called for Israel to reach a ceasefire "as soon as possible."

"China stands ready to work with the international community to pool efforts together and uphold justice, and work for restoring peace and stability in the Middle East.

A Telegram account affiliated with the Iran Revolutionary Guard Corps said Sunday that satellite images show Iran had evacuated everything from the Fordow site 48 hours before the US attack and moved it to a safe location.

"This image shows a large number of trucks that had quickly evacuated enrichment materials, equipment and other supplies from the Fordow site," the post reads. "It is clear that Trump's failed and dramatic attack not only did not damage the underground Fordow facilities, but the site was empty."

Rafael Mariano Grossi, the director-general of the IAEA, said Sunday he will call an emergency meeting of the IAEA Board of Governors on Monday after the American strike. He said Iranian nuclear officials had not recorded an increase in off-site radiation levels.

"As of this time, we don't expect that there will be any health consequences for people or the environment outside the targeted sites," Grossi said. "We will continue to monitor and assess the situation in Iran and provide further updates as additional information becomes available."

In apparent criticism of the United States, Grossi said he had "repeatedly stated that nuclear facilities should never be attacked." He called for Israel and the U.S. to stop their "hostilities" against Iran so that the IAEA's "vital inspection work" in Iran could continue.

Meanwhile, the IRGC-affiliated Telegram channel said Sunday that Iran struck Israel's Ben Gurion Airport, as well as a biological research center that reportedly housed research into biological warfare, among other military targets.

"This time, sirens sounded after the precise hits, throwing the enemy off balance," the statement said. "We announce that the main parts of the capacity of the Islamic Republic of Iran's armed forces in this sacred defense have not yet been put into operation."

Meanwhile, Israel's war against Gaza continues. The Gaza Health Ministry said Sunday that the death toll has risen to 55,959 people while medical facilities are facing blood shortages.

The WAFA news agency reported Sunday that Israeli forces reportedly detained at least 26 Palestinians in the West Bank on Sunday after conducting overnight raids.