President Trump said that Russian planes intruding into Nato airspace should be shot down in a marked hardening of tone towards Moscow amid frustration over his stalled attempt to end the Ukraine war.

In remarks after a fiery speech to the United Nations when he ridiculed Russia’s failure to defeat Ukraine, Trump said that direct involvement of the US in attacking Russian incursions would depend on the circumstances.

Before his meeting with President Zelensky, Trump was asked by a reporter: “Mr President, do you think that they should shoot down Russian aircraft if they enter their airspace?”

President Trump addressing the UN general assembly

YUKI IWAMURA/AP