Russia and Germany have slammed the United States' move to reinstate sanctions against Iran's vital oil exports, shipping, and banking, saying Moscow and Berlin would continue to trade with Tehran.

In Moscow's first official reaction since the restoration of Washington's bans on Tehran, Russian Foreign Minister Sergei Lavrov said on Tuesday that the US sanctions are "not legitimate."

Russia, itself a target of separate US sanctions, expected there would be ways to pursue economic cooperation with Iran despite the US sanctions, he added.

Speaking in Madrid after a meeting with his Spanish counterpart Josep Borrell, the Russian foreign minister said Washington had used "unacceptable methods" to exert pressure on operators of the Belgian-based SWIFT global payment network to cut off Iranian banks, Presstv Reported.

Lavrov emphasized that Russia and its European partners were looking for ways to maintain economic ties with Iran. However, he did not give more details.

Germany will continue trade with Iran despite US sanctions: FM

German Foreign Minister Heiko Maas also on Tuesday criticized the re-imposition of the US sanctions on Iran, saying his country considered it to be a "wrong" move.

Speaking at a joint news conference with Secretary General of the Council of Europe Thorbjorn Jagland in Berlin, Maas added that precautions were being taken "to ensure that business can continue with Iran."

He warned that economic destabilization of Iran would endanger European countries' security interests.