New Delhi, Feb. 20 -- US National Security Advisor Mike Waltz on Thursday, February 20, stated that Ukraine officials "need to tone it down" following a heated exchange between Donald Trump and Ukrainian President Volodymyr Zelenskyy.

Waltz told Fox News that the Ukrainians "need to tone it down and take a hard look and sign that deal," referring to the proposed minerals agreement.

At the same time, a press conference featuring US President Donald Trump's Ukraine envoy and Ukrainian President Volodymyr Zelenskyy was cancelled at the request of the US delegation, Euronews reported, citing officials in Kyiv.

The recent developments come after Donald Trump, on Wednesday, called Volodymyr Zelenskyy a "modestly successful comedian" and 'dic...