Iranian Foreign Minister Abbas Araghchi said he will fly to Russia, with whom Iran has a strategic partnership, for talks with President Vladimir Putin on Monday.
The United States intervened in the war against Iran alongside Israel during the night, attacking nuclear facilities including the well-fortified underground uranium enrichment facility Fordo.
"The US showed they have no respect for international law. They only understand the language of threat and force," Araghchi said in Istanbul, adding that Tehran has to respond based on its rights before diplomacy can be reconsidered.
Russia has "strongly condemned" the US attacks on Iranian nuclear facilities.
The "irresponsible decision" by the United States to bomb Iran violates international law and the United Nations Charter, the Russian Foreign Ministry in Moscow stated on Sunday.
The UN Security Council must respond to this, it said, adding that the attack has also harmed nuclear non-proliferation. Moscow said it therefore expects a clear response from the International Atomic Energy Agency.
Dmitry Medvedev, who serves as deputy head of President Vladimir Putin's Security Council, said several countries were prepared to supply Tehran with nuclear weapons.
He didn't specify which countries, but said the US attack caused minimal damage and would not stop Tehran from pursuing nuclear weapons.
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