Republican presidential front-runner Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE is targeting Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE in a new ad, portraying the Democratic presidential candidate as not tough enough to handle major foreign policy issues.

A 15-second video posted to Trump's Instagram account shows Russian President Vladimir Putin showing off his martial arts skills and a masked militant pointing a gun at the camera.

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"When it comes to facing our toughest opponents, the Democrats have the perfect answer," the video says, cutting to a clip of Clinton barking like a dog last month when she taunted Republicans.

Putin cracks up in Trump's video before text appears back on screen, stating, "We don't need to be a punchline!"

Trump last month had decried what he called a double standard over Clinton's barking, calling the former secretary of State a " joke ."

The candidates are sharpening their barbs at one another on the heels of victories in several big states on Tuesday, including Florida. Their respective delegate leads make Clinton and Trump the leaders for their respective nominations.

Clinton on Tuesday night criticized the billionaire on waterboarding and panning his potential to represent the U.S. on the international stage.

"Our commander in chief has to be able to defend our country, not embarrass it," Clinton said, knocking Trump's plans for "rounding up 12 million immigrants, banning all Muslims" from the U.S. and embracing "torture."