Holding their own plastic guns, Maksym and Andrii, both 11, salute Ukrainian soldiers while playing at their self-made “checkpoint” near Kharkiv on Wednesday.(Evgeniy Maloletka / Associated Press)BY LAURA KING, 

TRACY WILKINSON

JULY 24, 2022 2 AM PT

KYIV, Ukraine — The explosion is invariably spectacular: a gigantic spewing fireball, often followed by a slow-motion airborne cascade of secondary blasts. As soon as such footage finds its way online, exultant Ukrainian commentary erupts: “It’s HIMARS o’clock!”As its war with Russia enters a sixth month, Ukraine has been celebrating recent battlefield successes generated by sophisticated launchers known as High Mobility Artillery Rocket Systems, or HIMARS. The Pentagon has provided or promised a dozen of the advanced systems, capable of hitting targets up to 50 miles away.Following Russia’s full-scale invasion of its smaller neighbor on Feb. 24, the conflict has veered from Moscow’s initial failed effort to capture the capital, Kyiv, to substantial Ukrainian territorial losses this summer in the country’s eastern

industrial heartland.

Now the combat calculus appears to be shifting yet again, with Ukrainian forces, assisted by their new weaponry, striking dozens of sites, including Russian ammunition dumps, troop concentrations and bridges. That is seen as likely preparation for an offensive to regain Russian-held territory in the country’s south, near the Black Sea coast.

“Ukrainian forces are now using long-range rocket systems to great effect,” U.S. Defense Secretary Lloyd J. Austin III said last week during a virtual meeting of 50 countries that are donating equipment to Ukraine. “I think that everyone here understands the difference that they’ve made on the ground.”

That battlefield effect, however, leaves Ukrainian officials treading a fine line.

President Volodymyr Zelensky and other top officials continue to issue forceful pleas for more Western weaponry, declaring bluntly that Ukraine cannot seize the military initiative without far more donated armaments. Ukraine’s first lady, Olena Zelenska, made an unusual personal appearance Wednesday before Congress, where she graphically invoked civilian suffering at Russian hands while also appealing for additional military materiel.

But at the same time, Zelensky and his lieutenants seek to depict a landscape in which their armed forces already may be poised to gain the upper hand — implicitly promising that the country’s sacrifice of lives, together with Western allies’ growing economic and energy strains stemming from the war, will ultimately prove worthwhile.

“We have a significant potential for the advance of our forces on the front, and for the infliction of significant new losses on the occupiers,” Zelensky said late Thursday in his nightly address to the country.