BERLIN >> Russia took new steps Friday to gird for an escalating struggle with the West over the war in Ukraine, moving to expand military recruitment to older citizens and severing gas supplies to Finland in apparent retaliation for its Nordic neighbor’s application to join the NATO alliance.

The two developments reflected the mounting pressure on Russia because of its 3-month-old invasion of Ukraine, which has evolved into something of a stalemate that has seriously depleted the Kremlin’s conventional war capabilities, even as Russia has made some incremental gains.

The conflict also has left Russia increasingly vulnerable economically and energized Western opposition in ways that President Vladimir Putin had sought to prevent. Both Sweden and Finland, which share land and sea borders with Russia, broke with their long-standing policies of neutrality and applied to join NATO over the past week, a vote of confidence in the unity of an alliance that has been cemented by the conflict.

Russia said Friday that it was suspending gas shipments to Finland because the Finnish gas company had failed to make payments in rubles. But the Kremlin has used Russia’s energy supply as a political weapon in the past and previously threatened “retaliation” against Sweden and Finland should they move to join NATO. Last weekend, Moscow suspended electricity exports to Finland after the country’s intention to join the alliance became clear.

The Finnish company, Gasum, called the latest move from the Russian gas giant Gazprom “highly regrettable” but said that it did not expect disruptions.

Gas exports are vital to Russia’s economy. They also give Moscow a potent diplomatic tool: Last month, Russia halted natural gas supplies to Poland and Bulgaria, two NATO countries that are dependent on Russian gas but have strongly opposed the war in Ukraine. Poland and Bulgaria also had balked at making payments in rubles.

Russia’s reaction underscored the geopolitical fallout from the war in Ukraine as it spurs what could become one of the most radical redrawings of Europe’s security order in decades.

That fallout spread further Friday as the state-controlled Russian oil giant Rosneft announced that Gerhard Schröder, former chancellor of Germany and one of Putin’s last prominent Western cheerleaders, would be stepping down as chair of the board.

Moscow is increasingly mired in difficulties on the ground in Ukraine, a former Soviet republic that Putin does not consider a legitimate country. His plan for a quick subjugation of Ukraine after the Feb. 24 invasion has been upended by a series of bruising battles that have forced him to reduce his territorial ambitions and have left Russia’s forces exhausted and its equipment diminished.

Under pressure to score victories and to shore up its forces for an intensifying battle in the Donbas region of eastern Ukraine, Moscow on Friday moved to expand the pool of potential recruits to its military by eliminating the age limit for service.

An amendment introduced by senior lawmakers in Russia’s parliament would allow Russians older than 40 to sign first-time military service contracts. Under the current law, Russian citizens must be ages 18-40 to sign a first-time contract.

The law would bring in more service members with specialties, such as medical workers and engineers, a statement from the lower house of parliament said.

“Highly professional specialists are needed” to operate military equipment, the statement said.

It made no mention of a manpower shortage in the field. But experts say that Russia suffers that shortage and is under strain, particularly after a series of humiliating setbacks in trying to capture Ukraine’s capital, Kyiv, and more recently in failing to seize the country’s second-largest city, Kharkiv.

Putin has resisted ordering a large-scale military draft, apparently fearing domestic backlash, and is instead stepping up recruitment.

The lack of reserve troops is forcing Russian commanders to consolidate depleted battalion tactical groups, according to the Institute for the Study of War, a Washington-based research group that has been monitoring the conflict.

The institute quoted an unidentified U.S. defense official as saying that Russian forces have had to disband and combine some battalion tactical groups in Ukraine to compensate for casualties and other losses.

At the same time, the institute said that some Russian troops who had been withdrawn from around Kharkiv, in the northeast of the country, have been redeployed toward the Donetsk region in Donbas.

Even as Russia’s war aims have narrowed, it was fortifying control over parts of Ukraine this week.

After the near-total conquest of the southeast port city of Mariupol, Russian officials appeared to be laying the groundwork for annexing swaths of southeast Ukraine. They have already made changes in some areas, introducing the ruble currency, installing proxy politicians and cutting the population off from Ukrainian broadcasts.

Units that fought in Mariupol can now be sent elsewhere following the surrender of Ukrainian fighters defending a large steel plant. A Russia Defense Ministry spokesperson, Maj. Gen. Igor Konashenkov, said Friday that its forces had full control of the plant, which has been “completely liberated.”

The focus has shifted to the eastern battlefield. In the Donbas region, which Russia has vowed to capture after having abandoned more ambitious goals of toppling the central government, Russian troops carried out 13 attacks on Ukrainian positions, the Ukrainian military said.

A weekslong fight around the city of Sievierodonetsk, in the Luhansk region, has intensified in the past day, with Russian forces on Friday firing artillery at a school where more than 200 people were sheltering, killing three of them, a regional military official said.

Russian artillery fire into the city and nearby areas killed 12 civilians and damaged more than 60 buildings over the past day, said the governor of Luhansk province. The Ukrainian military said Friday in its regularly published morning assessment of the war that its forces had repelled a Russian attempt to storm defensive positions near Sievierodonetsk.

To help keep the Ukrainian war effort running, the Group of 7 major economic powers on Friday agreed to provide nearly $20 billion in grants and loans to support Ukraine’s economy over the coming months.

Ukraine needs approximately $5 billion per month to maintain basic government services, according to the International Monetary Fund. The G-7 financing was agreed on after the United States, which is contributing more than $9 billion in short-term financing, pressed allies to do more to help secure Ukraine’s future.

While Ukraine’s government has expressed gratitude for Western economic and military aid, it has been critical of NATO over what Ukrainian officials have called the alliance’s lack of support since the Russian invasion.

“Could you name at least one consensus decision made by NATO over the past three months that would benefit and help Ukraine?” Foreign Minister Dmytro Kuleba said Thursday night during a nationwide telethon to raise funds for the country.

Under NATO’s treaty, an attack on one of its 30 members is an attack on all — a provision that has amplified the risk of an escalation with Russia, including the possibility, however remote, of a nuclear war.

While NATO officials have expressed strong support for Ukraine, they have balked at taking any steps that could provoke a Russian attack on any alliance member — rejecting, for example, the Ukrainian government’s repeated pleas to create a no-fly zone over Ukraine.

Individually, many NATO countries have provided Kyiv with weaponry and missiles — aid that Kuleba acknowledged.

“Yes, it is true that the alliance members, individually or in small groups, are really doing awesome and important work, providing vital assistance,” Kuleba said. “But NATO as an institution has done nothing during this time.”

The latest tests for NATO unity are the accession bids by Finland and Sweden, which still face opposition from President Recep Tayyip Erdogan of Turkey, who has complained of what he calls their tolerance toward Kurdish militant separatist groups that are considered terrorist organizations in his country.

The Biden administration, which has strongly endorsed the applications of Finland and Sweden, has repeatedly expressed confidence that Turkey’s objections will be resolved.

This article originally appeared in The New York Times.