President Donald Trump has expressed doubts that Russian President Vladimir Putin wants to end its war with Ukraine which has raged for more than three years.

Trump took to Truth Social on Saturday to express his growing frustration with the Russian leader in a week that saw Russia launch a deadly missile attack on Kyiv. The Thursday attack on Ukraine killed 12 people and injured at least 90, including children.

"There was no reason for Putin to be shooting missiles into civilian areas, cities and towns, over the last few days," Trump wrote, shortly after he met with Ukrainian President Volodymyr Zelenskyy at the Vatican on Saturday for Pope Francis’ funeral.