Eliot Engel/sotu.blogs.cnn.com

The legislation, announced on April 29 by U.S. Representatives Eliot Engel (Democrat-New York) and Adam Kinzinger (Republican-Illinois), aims to bolster U.S. support for Kyiv with measures that include tightened sanctions against Russia and a push for greater private investment in the Ukrainian economy, according to RFE/RL.

"We need to build on our sanctions regime against troublemakers in the Kremlin, while working to preserve transatlantic unity," Engel, the top Democrat on the House Foreign Affairs Committee, said in a statement.

"And we need to find ways of shoring up Ukraine and deterring [Russian President Vladimir] Putin that go beyond just throwing more money at the problem," Engel added.

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The bill would require that the U.S. president, prior to lifting a raft of Ukraine-related sanctions, submit "certification" to Congress that Ukraine has restored "sovereignty" over Crimea or that the peninsula's status has been resolved to the satisfaction "of a democratically elected government" in Kyiv, the statement reads.

"As we have seen time and again, there is no stopping Vladimir Putin's disrespect for global order, especially in regards to Ukraine," Kinzinger said.

"It's time for the United States to stand up and reiterate that it will not tolerate Russia's aggression," he said.

Called the Stability And Democracy For Ukraine Act, the legislation was introduced in the House of Representatives on April 28 by Engel, Kinzinger, and 14 other co-sponsors, RFE/RL writes.