What's the deal with Trump's turn against Putin?

In a dramatic reversal of his long-held conciliatory stance toward President Putin, President Trump has unveiled a sweeping arms deal for Ukraine and issued a stark ultimatum to Moscow. The move — marking his most aggressive policy shift on the war to date — includes advanced missile systems and threats of severe economic retaliation.

It signals not only a potential turning point in the three-year conflict, but also a fundamental recalibration of Trump’s approach to Russian aggression.

So, what is behind the sudden change?