KYIV, July 23 (Reuters) - Ukrainian President Volodymyr Zelenskyy said a ceasefire with Russia without reclaiming lost territories would only prolong the war, according to an interview with the Wall Street Journal on Friday (Jul 22).

He warned that a ceasefire that allows Russia to keep Ukrainian territories seized since the invasion in February would only encourage an even wider conflict, giving Moscow an opportunity to replenish and rearm for the next round.

Zelenskyy also spoke about US-supplied high mobility artillery rocket systems (HIMARS), saying, "the Western supplies of Himars, while making a material difference, are much lower than what Ukraine needs to turn the tide".

"Freezing the conflict with the Russian Federation means a pause that gives the Russian Federation a break for rest," the Wall Street Journal reported, citing comments by Zelenskyy.

He said, "Society believes that all the territories must be liberated first, and then we can negotiate about what to do and how we could live in the centuries ahead".

"A more pressing need is air-defense systems that could prevent Russia from raining long-range missiles on otherwise peaceful cities hundreds of miles from the front lines," Zelenskyy added.

Referring to the deal signed with Russia to reopen grain exports Zelenskyy said, "Diplomatic concessions to Moscow might stabilise the markets somewhat, but would only provide a temporary respite and boomerang in the future".

Russia and Ukraine signed a landmark deal on Friday to reopen Ukrainian Black Sea ports for grain exports, raising hopes that an international food crisis aggravated by the Russian invasion can be eased.