Moscow and Washington halted attempts by each other in the UN Security Council (UNSC) to set up global investigations into chemical weapons attacks in Syria, which is in the throes of a seven-year-old civil war. It is now operating off Lebanon alongside USA ships as part of France's military contingent fighting Islamic State militants in Syria and Iraq.
He called for a "strong and joint response" to the attack in the Syrian town of Douma on Saturday, which Syrian activists and rescuers say killed 40 people.
The Russian military said on March 13 that it would respond to any US strike on Syria.
Sweden's ambassador, Olof Skoog, who tried unsuccessfully to find a compromise solution, told the council after the third vote that he was disappointed. A British government statement said the two agreed the attack in Syria was "utterly reprehensible" and that the global community must respond "to uphold the worldwide prohibition on the use of chemical weapons".
After the defeat of Russia's second resolution, Russian Ambassador Vassily Nebenzia said to U.S. Ambassador Nikki Haley: "I would once again ask you, once again beseech you, to refrain from the plans that you're now developing for Syria".
"Due to the possible launch of air strikes into Syria with air-to-ground and/or cruise missiles within the next 72 hours, and the possibility of intermittent disruption of radio navigation equipment, due consideration needs to be taken when planning flight operations in the Eastern Mediterranean/Nicosia FIR area", it said, referring to the designated airspace, Reuters reports.
Trump had on Monday warned of a quick, forceful response once responsibility for the attack was established.
"I would once again ask you, once again beseech you, to refrain from the plans that you're now developing for Syria", he said after the council failed to approve a third draft resolution on chemical weapons attacks in Syria.
Both Russia and Iran, Assad's other main ally, have warned his enemies against military action in recent days, underlining their commitment to the Syrian government they have armed and supported through years of conflict.
Haley said the Russian plan would have allowed Russia to choose the investigators and assess the outcome of the investigation. "Does any of that sound independent or impartial?"
He said that Russian Federation has 'the necessary means for that and the Americans and their allies know that quite well'.
"You do not want to hear the fact that no traces of a chemical attack were found in Douma", Nebenzia said.
"You simply have been looking for a pretext" to take military action, he said.
The World Health Organization (WHO) has demanded "unhindered access" to Douma in Syria to check reports from its partners that 500 people were affected by a chemical attack there. The latter attack led to a US airstrike on a Syrian airfield.
USA ambassador to the United Nations, Nikki Haley shakes hands with the Russian Ambassador UN Vassily Nebenzia during a UN Security Council meeting on Tuesday.
The council voted on two proposals put forward by Russian Federation, but both measures failed to garner the nine votes required for adoption.
President Emmanuel Macron said France, the US and Britain will decide how to respond in the coming days.
The worldwide chemical weapons watchdog, the Organization for the Prohibition of Chemical Weapons, said on April 10 that it was sending a team of experts to the site of the Douma attack to gather evidence and determine whether it involved banned chemical weapons.