KYIV, Ukraine — Tons of of die-hard Ukrainian troopers who had made a final stand in opposition to Russian forces from a Mariupol metal mill confronted an unsure future Tuesday beneath Kremlin custody after Ukraine’s navy ordered them to give up.

The give up directive, issued late Monday, made the troopers prisoners and ended essentially the most protracted battle to date of the almost three-month-old Russian invasion of Ukraine.

At the same time as Russia has struggled on different battlefronts, the give up at Mariupol solidified one in all Russia’s few important territorial achievements — the conquest of a once-thriving southeast port. The give up additionally gave Russia’s state-run media the substances for claiming its facet was profitable.

Nonetheless, Mariupol has been largely decreased to smash, Ukrainian officials say that more than 20,000 inhabitants have been killed, and town has come to represent the conflict’s grotesque horrors.

By early Tuesday, lots of the fighters ensconced in a warren of shelters beneath the Azovstal metal mill, a Soviet-era complicated besieged by the Russians for weeks, had emerged and surrendered. They have been transported to Russian-held territory aboard buses emblazoned with “Z” — the Russian emblem for what President Vladimir V. Putin has referred to as his nation’s “particular navy operation” in Ukraine.

The Ukrainian authorities mentioned little concerning the phrases of the give up besides to claim that the Ukrainian fighters have been heroes and that as prisoners they’d quickly be exchanged for Russian prisoners held by Ukraine.

“The one factor that may be mentioned is that the Ukrainian state is doing every part doable and unattainable” to avoid wasting the troopers, Ukraine’s deputy protection minister, Hanna Malyar, mentioned at a information convention Tuesday afternoon.

However Russian officers mentioned nothing about an alternate — quite the opposite, they raised the prospect that not less than a number of the prisoners could be handled as conflict criminals.

Russia’s Investigative Committee, the nation’s equal to the F.B.I., mentioned Tuesday that investigators would interrogate the captured fighters to “test their involvement in crimes dedicated in opposition to civilians.”

And the prosecutor common’s workplace requested Russia’s Supreme Courtroom to declare the navy unit to which a lot of the captured fighters belong, the Azov battalion, a terrorist group. Russian information media have seized on the Azov battalion’s connections to far-right actions to supply a veneer of credibility to the Kremlin’s false claims that Russia’s forces have been combating Nazis in Ukraine.

The Russian threats in opposition to the prisoners raised questions concerning the viability of the phrases Ukraine had negotiated with Moscow to give up, and whether or not the tons of of troops nonetheless remaining contained in the metal plant would abide by the deal.

Information of Ukraine’s give up order to its personal fighters, broadly seen domestically as heroes who’ve stared down deprivation and doom, was greeted with nervousness within the nation, the place antipathy towards Russia has solely deepened for the reason that conflict.

Many expressed fears that the final defenders of Mariupol would undergo as prisoners of Russia — although the almost definitely different was sure loss of life contained in the metal works.

“I’m ready for information and praying,” mentioned Natalia Zarytska, who was a part of a delegation of wives and moms of males inside Azovstal who had sought the intervention of Turkey, which has good relations with each Russia and Ukraine, to guarantee a secure evacuation route for his or her family members.

The Ukrainian authorities sought to extol the valor of the fighters, who refused to give up till ordered.

“83 days of Mariupol protection will go down in historical past because the Thermopylae of the XXI century,” Mykhailo Podolyak, one in all President Volodymyr Zelensky’s prime advisers, said on Twitter, referring to the 480 B.C. battle by which an outnumbered drive of Greeks confronted a a lot bigger Persian military. He mentioned the defenders in Azovstal had “ruined” Russia’s plan to seize jap Ukraine and “utterly modified the course of the conflict.”

Nonetheless, the destiny of the captured troopers may create political issues for Mr. Zelensky, whose management by way of the conflict has boosted his reputation at residence and in pleasant Western international locations.

Mr. Putin may additionally face a clumsy resolution over releasing any of the captives — even in a prisoner swap — since he has repeatedly sought to solid Azov battalion members as Nazis. Repatriating them may undercut that fictitious narrative.

Ukraine’s resolution to halt the armed protection on the plant appeared to finish the final vestige of resistance stopping Russia from absolutely controlling a swath of southeastern Ukraine stretching from the Russian border to the Crimean Peninsula, which was seized by Russia eight years in the past.

The developments within the south underscore how a lot territory Moscow has captured and recommend that Ukrainian forces will face steep challenges in attempting to regain it. On the identical time, Ukraine’s navy has been emboldened by its successes in opposition to Russian forces elsewhere, so the prospects for a negotiated settlement have dimmed.

Either side acknowledge that talks have basically collapsed amid publicly aired recriminations.

Alongside a path stretching greater than 500 miles from Luhansk within the east to Kherson on the Black Sea, the Ukrainian navy mentioned Russian forces have been constructing defensive positions, putting in governments with fealty to the Kremlin and taking steps to “Russify” the inhabitants.

In Zaporizhzhia, a area west of Mariupol, the Ukrainian navy mentioned that Russian forces had been destroying roads and bridges to sluggish Ukrainian counterattacks. Moscow’s troops additionally erected concrete limitations and dug trenches round Europe’s largest nuclear energy plant, within the metropolis of Enerhodar, which Russia seized within the first month of the conflict, Ukraine’s nuclear energy firm mentioned.

Within the Russia-occupied Kherson area, the nation’s agricultural heartland, the Ukrainians have been mounting counterattacks for weeks, slowly attempting to reclaim misplaced floor, however have but to launch a serious offensive.

The Ukrainian navy mentioned Tuesday night that Russia was taking steps to arrange for a long-term navy occupation. “The conflict is getting into a protracted part,” the Ministry of Protection mentioned in an announcement. “We see how within the Kherson area, within the Zaporizhzhia area, the Russian invaders are actively finishing up engineering and fortification work to maneuver to protection if needed.”

Nonetheless, Ukrainian forces, backed by an growing circulation of heavy weapons from Western allies, have mounted fierce resistance on different battle fronts, driving Russian forces first from the capital, Kyiv, and in current days from the northeastern metropolis of Kharkiv.

Ukrainian officers mentioned Tuesday that greater than 50 “significantly injured” fighters from Mariupol have been being transported to a hospital in Novoazovsk, a Ukrainian city close to the Russian border that’s managed by Moscow-backed separatists. One other 211 folks have been evacuated by way of a humanitarian hall to Olenivka, additionally beneath Russian management.

Ukrainian officers mentioned that the troopers could be returned to Ukrainian-held territory “beneath an alternate process.”

Nevertheless, it was unclear who was guaranteeing the safety of the servicemen and whether or not any process had been agreed upon earlier than the evacuation started.

“These 211 individuals who have been evacuated to Olenivka, their destiny is paramount to barter about proper now,” Kira Rudik, a member of parliament and chief of the Holos occasion, concerned in negotiations about Azovstal, mentioned on Tuesday afternoon.

In current days, Western international locations have reaffirmed their assist for Ukraine, and in opposition to Russian pursuits.

The leaders of Sweden and Finland mentioned Tuesday that they’d collectively submit their applications to join the NATO alliance this week and would go to Washington to satisfy with President Biden, who strongly helps their plans.

In Brussels, Treasury Secretary Janet L. Yellen exhorted European Union nations to extend their spending on Ukraine to assist it deal with the financial disaster and rebuilding that will probably be required due to the Russian invasion.

“Our joint efforts are important to assist guarantee Ukraine’s democracy prevails over Putin’s aggression,” Ms. Yellen, within the midst of a weeklong journey to Europe, advised the Brussels Financial Discussion board.

Congress has already accepted a $13.6 billion emergency spending package for Ukraine and is anticipated to approve an extra $40 billion worth of aid.

Valerie Hopkins reported from Kyiv, Marc Santora from Krakow, Poland, Ivan Nechepurenko from Tbilisi, Georgia, and Rick Gladstone from New York. Reporting was contributed by Alan Rappeport from Brussels, Safak Timur from Istanbul, and Johanna Lemola from Helsinki.