TALLINN, Estonia (AP) — Advertisements promise cash bonuses and enticing benefits. Recruiters are making cold calls to eligible men. Enlistment offices are working with universities and social service agencies to lure students and the unemployed.

A new campaign is underway this spring across Russia, seeking recruits to replenish its troops for the war in Ukraine.

As fighting grinds on in Ukrainian battlegrounds like Bakhmut and both sides prepare for counteroffensives that could cost even more lives, the Kremlin’s war machine badly needs new recruits.

A mobilization in September of 300,000 reservists — billed as a “partial” call-up — sent panic throughout the country, since most men under 65 are formally part of the reserve. Tens of thousands fled Russia rather than report to recruiting stations.

The Kremlin denies that another call-up is planned for what it calls its “special military operation” in Ukraine, now more than a year old.

But amid widespread uncertainty of whether such a move will eventually happen, the government is enticing men to volunteer, either at makeshift recruiting centers popping up in various regions, or with phone calls from enlistment officials. That way, it can “avoid declaring a formal second mobilization wave” after the first one proved so unpopular, according to a recent report by the U.S.-based think tank Institute of the Study of War.

One Muscovite told The Associated Press that his employer, a state-funded organization, gathered up the military registration cards of all male employees of fighting age and said it would get them deferments.

But he said the move still sent a wave of fear through him.

“It makes you nervous and scared — no one wants to all of a sudden end up in a war with a rifle in their hands,” said the resident, who spoke on condition of anonymity because he feared reprisal. “The special operation is somewhat dragging on, so any surprises from the Russian authorities can be expected.”

It’s been more than a week since he handed in his card, he said, and exemptions usually get resolved in a day or two, heightening his anxiety.

Russian media report that men across the country are receiving summonses from enlistment offices. In most of those cases, men were simply asked to update their records; in others, they were ordered to take part in military training.

Kremlin spokesman Dmitry Peskov said last week that serving summonses to update records in enlistment offices is “usual practice” and a “continued undertaking.”

Other unconfirmed media reports say authorities have told regional governments to recruit a certain number of volunteers. Some officials announced setting up recruitment centers with the goal of getting men to sign contracts that enable them to be sent into combat as professional soldiers.

Ads have appeared on government websites and on the social media accounts of state institutions and organizations, including libraries and high schools.

One of them, posted by a municipal administration in the western Yaroslavl region, promised a one-time bonus of about $3,800 to sign up, and if sent to Ukraine, a monthly salary of up to $2,500, plus about $100 a day for “involvement in active offensive operations,” and $650 “for each kilometer of advancement within assault teams.”

The ad said the soldier would also get tax and loan repayment breaks, preferential university admission status for his children, generous compensation for his family if he is wounded or killed in action, and the status of a war veteran, which carries even more perks.

In the Siberian city of Novosibirsk, officials asked universities, colleges and vocational schools to advertise for recruits on their websites, said Sergei Chernyshov, founder of a private vocational school there.

Chernyshov posted the ad on his social media account “so that everyone knows what our city hall is up to,” but he told the AP that he doesn’t plan to put it on the school website. “It’s weird” to target vocational school students, he said.

Other efforts include enlistment officials meeting with college students and unemployed men, or phoning men to volunteer.

A Muscovite who spoke on condition of anonymity for his own safety said that he received such a call and was surprised at how polite it was: “After my ‘No,’ there were no threats or (attempts to) convince me — (just) ‘Thanks, goodbye.'”

There have only been isolated cases of enlistment officials really pressuring men to sign up, said Grigory Sverdlin, founder of a group called Go by the Forest that helps men avoid mobilization.

The group gets up to 100 messages a day from men seeking advice on dealing with summonses or enlistment officials, he said, compared with dozens per day in recent months. In most cases, the officials wanted to update their records with addresses and phone numbers, and they might try to recruit men during that process.

But Sverdlin said some cases stand out.

In the Vologda region, about 400 kilometers (250 miles) north of Moscow, the group received messages saying that almost everyone going to the enlistment office after receiving a summons “is forced to sign a paper barring them from leaving the region,” he said.