Moscow sees a bill on support for Ukraine that has just passed U.S. Congress as an anti-Russian move, but whether Russia will react to it depends on whether President Barack Obama signs it into law, Russian Foreign Minister Sergei Lavrov said on Monday.

"This move by the United States is, of course, hostile. The president has the option of signing or not signing this law," Lavrov told Interfax in comments on the planned Ukraine Freedom Support Act. "Let's base our conduct on concrete actions concerning putting this law into force and its practical enforcement."

"The measures that are set out in that bill are to a significant extent a proposal that the American president act at his discretion," the minister said.

"There would exist exceptions and provisions that were binding on [Obama], provisions that made it mandatory that [Obama] take measures against Rosoboronexport, for example. Moreover, those measures would have to be applied extraterritorially, including against partners of our companies that are under the American sanctions," Lavrov said.

"This practice is illegitimate per se, as, in effect, are sanctions that have no approval from the UN Security Council," he said.

Lavrov said many of Russia's defense industry enterprises have partners in Ukraine. "So dealing a blow to the industry of our Ukrainian neighbors, who are in a deplorable state as it is, is counterproductive from the point of view of American interests," he said.

"This example alone shows that the reason for this whole undertaking is not at all any concern for Ukraine but a maniac desire to punish Russia for all imaginable and unimaginable transgressions," the minister said.

The Ukraine Freedom Support Act would authorize the president to impose extra sanctions on the Russian energy sector and Russia's Rosobornexport company and help Ukraine's armed forces, defense industry, energy sector and displaced persons.