WASHINGTON — Republicans and Democrats spoke with one voice on Monday in pressing President Obama to sign legislation that would slap new sanctions on Russia while providing weapons and other assistance to Ukraine.

The widely popular legislation cleared Congress late Saturday, but the White House has remained noncommittal about whether Obama will sign it into law. Administration officials say the president is evaluating the measure, which would target Russia’s energy and defense industries.

House Speaker John Boehner, R-Ohio, issued a statement saying the bipartisan bill underscores Congress’ “strong moral commitment to the cause of the Ukrainian people” and he called on Obama to sign it immediately.

Sen. Bob Menendez, D-N.J., chairman of the Foreign Relations Committee, said lawmakers “stand shoulder to shoulder in solidarity with the Ukrainian government and its people against the aggression of Vladimir Putin who continues to upend the international order.”

The legislation would require the president to impose penalties on state-owned arms dealer Rosoboronexport and other Russian defense companies tied to unrest in Ukraine, Moldova, Georgia and Syria. The sanctions would be extended to individuals and entities that help the companies.

The bill also would give the president the authority to provide lethal and nonlethal military assistance to Ukraine. This includes anti-tank weapons, counter-artillery radar and tactical surveillance drones. The bill also authorizes $350 million over two years to cover the cost.

Russia annexed Crimea earlier this year and has given support to pro-Russian rebels in eastern Ukraine, angering Western nations.

Visiting NATO headquarters in Brussels on Monday, Ukraine’s prime minister asked for help for his country’s military as it tries to tamp down pro-Russian insurgents and pleaded for more financial aid from the European Union.