Dmitry Medvedev, the deputy chairman of Russia's Security Council, was adamant on Sunday that U.S. President Donald Trump had started a new war for the U.S. by attacking Iran.

And that the war could lead to "a number of countries ... ready to directly supply Iran with their own nuclear warheads," though he did not name which countries.

Medvedev condemned the United States in comments made on Telegram. 

Iran's foreign minister, Abbas Araghchi, drove the point home at a press conference at an Organisation of Islamic Cooperation summit in Istanbul, Sunday: "Russia is a friend of Iran, we always consult with each other," Araghchi told reporters. He added: "I'm going to Moscow this afternoon for serious consultations with the Russian president tomorrow morning."

U.S. forces struck Iran's three main nuclear sites, Trump said late on Saturday, and he warned Tehran it would face more devastating attacks if it does not agree to peace.

"Trump, who came in as a peacemaker president, has started a new war for the U.S.," Medvedev wrote on Telegram, adding that "with this kind of success, Trump won't win the Nobel Peace Prize."

Medvedev, a former Russian president, slammed the efforts of the United States, saying they failed to achieve their objectives: "Critical infrastructure of the nuclear fuel cycle appears to have been unaffected or sustained only minor damage," he wrote on Telegram. "The enrichment of nuclear material — and now we can say it outright, the future production of nuclear weapons — will continue."

The leader of Russia's Liberal Democratic Party, Leonid Slutsky, agreed, and said the strikes "had no military reason for the U.S. and cannot be justified under international law."

"The consequences of the escalation threaten to go beyond the region. Washington understands the inevitability of Tehran's response. All this brings the spiral of confrontation to a new level and increases the risks of World War III," Slutsky, who heads the State Duma international affairs committee, wrote on Telegram.