He said updated data on Russian losses show that 198,000 have been killed and more than 550,000 wounded.
Zelenskyy made the post after meeting with U.S. President-elect Donald Trump and French President Emmanuel Macron as world leaders gathered over the weekend in Paris for the ceremonial reopening of Notre-Dame.
Trump wrote: “There should be an immediate ceasefire and negotiations should begin.
“Too many lives are being so needlessly wasted, too many families destroyed, and if it keeps going, it can turn into something much bigger, and far worse.
“I know Vladimir well. This is his time to act. China can help. The world is waiting.”
Zelenskyy said that he had a “good meeting” with Trump.
However, any decision for Ukraine to join the military alliance would require a longer process and the unanimous agreement of the member states.
Kellogg and former National Security Council chief of staff Fred Fleitz outlined a plan for ending the war earlier this year, saying that they would seek to freeze the front lines and push for negotiations between Ukraine and Russia.
Kellogg and Fleitz previously published some of the points of their plan in a research paper for the America First Policy Institute think tank, where both hold leadership positions.
That report characterized Russia’s invasion of Ukraine as an avoidable conflict brought about by the Biden administration’s foreign policy platform.
The paper also underscored Russian President Vladimir Putin’s repeated claims that Ukraine must not be allowed to join NATO.
Amid continued hostilities in the Russia–Ukraine conflict, concerns are mounting over broader geopolitical implications.
Last month, Ukraine conducted its first strikes inside Russian territory with U.S.-made long-range ATACMS missiles
On Nov. 18, Putin signed a new doctrine lowering the threshold for using nuclear weapons.
The doctrine now states that an attack on Russia by any nation using conventional missiles supplied by a nuclear power will be considered a joint attack.