Ukrainian President Volodymyr Zelenskyy on Tuesday said the signals from peace talks with Russia could be called positive, but expressed caution about Russia's promise to sharply curtail military action in some areas and said Ukraine would not be easing off its defensive efforts.

"We can say the signals we are receiving from the talks are positive but they do not drown out the explosions of Russian shells," he said, adding that Ukraine could only trust a concrete result from the talks.