Europe pushed Monday to sharpen and expand its response to Russia’s invasion of Ukraine, with Sweden poised to follow Finland in seeking membership of NATO and European Union officials working to rescue proposed sanctions that would target the Russian oil exports helping finance the war.

On the ground, Russia saw more setbacks in its offensive in the east, where Ukrainian defenders are fighting desperately against attempted advances and even successfully rolling back the front lines in some areas.

In a small but symbolic boost for Ukrainian morale, a patrol of soldiers recorded triumphant video of their push to the Russian border in the region of Kharkiv. Ukrainian forces have already driven Russian troops back from the region’s capital, reducing their ability to hit the battered city with artillery.

As fighting raged, international efforts to respond to Russia’s aggression continued to pick up pace. Sweden’s government was expected to announce its intention to seek NATO membership later Monday — following a similar decision from its neighbor Finland. Those are seismic developments for the Nordic countries that have traditionally positioned themselves as militarily “nonaligned.”

An enlargement of NATO to include Sweden and Finland would be a serious blow to Russian President Vladimir Putin, who sees the alliance’s post-Cold War expansion in Eastern Europe as a threat. Putin has cited it among his reasons for attacking Ukraine. His spokesman, Dmitry Peskov, said Monday that Russia “will look carefully at what the consequences will be of Finland and Sweden joining NATO.”

NATO’s secretary-general, Jens Stoltenberg, has said the membership process for both Finland and Sweden could be very quick — though member Turkey has cast some doubt over the move.

Swedish Prime Minister Magdalena Andersson said Monday that joining the 30-member military alliance was her country’s best defense in the face of Russian behavior.

“Unfortunately, we have no reason to believe that the trend (of Russia’s actions) will reverse in the foreseeable future,” she said.

As well as sending military aid to Ukraine, Europe is also working to choke off funding for the Kremlin’s war, by reducing the billions of dollars it spends on imports of Russian energy.

But a proposed EU embargo on imports of Russian oil faces opposition from a small group of countries led by Hungary, which is one of a number of landlocked countries that are highly dependent on the imports, along with the Czech Republic and Slovakia. Bulgaria also has reservations.

“We will do our best in order to deblock the situation,” EU foreign policy chief Josep Borrell said. “I cannot ensure that it is going to happen because positions are quite strong.”

Western weapons deliveries to Ukraine and sanctions against Russia have helped the outgunned and outnumbered Ukrainian forces slow the Russian advance — and even turn it back in places.

Stoltenberg, the NATO chief, said Sunday the war “is not going as Moscow had planned.”

“Ukraine can win this war,” he added — a remarkable assessment that would have been unthinkable for many on the eve of the invasion.

But Russia has been plagued by a series of setbacks in the war, most glaringly in its failure to overrun Kyiv, the capital, in the early stages of its Feb. 24 invasion. Since then, much of the fighting has shifted to the Donbas, Ukraine’s eastern industrial heartland.

Determining a full picture of the unfolding battle there is difficult. Airstrikes and artillery barrages make it extremely dangerous for journalists to move around, and reporting is restricted by Ukraine and the Moscow-backed separatists it has been fighting in the Donbas for eight years.

The battlefront in the east and south of Ukraine extends over hundreds of kilometers (miles), stretching men, machines and resources. The two sides have been fighting village-by-village in parts. Ukrainian forces have ground down the Russians, but are taking losses, too.

In the Luhansk region of the Donbas, strikes overnight hit a hospital in Severodonetsk, killing two and wounding nine, including a child, the regional military command said Monday. Overnight strikes also hit other towns. Regional military governor Serhiy Haidai said Ukrainian special forces blew up Russian-held railway bridges between as part of efforts to slow the Russian offensive. The information could not immediately be independently verified.

Meanwhile, in the south, a strike Monday wounded three people in the Odesa region. Air raid sirens ring out routinely in the region and its iconic Black Sea port city, also called Odesa. Visitors who would normally fill the city as the tourist season kicks off this time of year are absent, and the streets of the usually lively city are quiet.

“This battle is dragging on. Russia does not stop attacking and advancing,” Ukrainian military analyst Oleh Zhdanov said in recent days. “The fate of the confrontation depends on the speed of supply of Western weapons. ”

In a symbolic boost, a Ukrainian patrol in the Kharkiv region reached the Russian border and made a victorious video there addressed to President Volodymyr Zelenskyy. The video posted Sunday on Facebook by Ukraine’s Ministry of Defense shows a dozen fighters around a wooden post — painted blue and yellow, Ukraine’s colors — that they carried with them and then stood upright as a border marker, in triumph. It was not clear exactly where the video was shot.

One soldier said the unit went “to the dividing line with the Russian Federation, the occupying country. Mr. President, we have reached it. We are here.” Other fighters made victory signs and raised their fists.

Along another section of the frontier with Russia, Ukrainian border guards said they defeated a Russian attempt Monday morning to send troops into the northern Sumy region. The border guard service said Russian forces deployed mortars, grenade launchers and machine guns in an attempt to cover a “sabotage and reconnaissance group” crossing the border from Russia.

The border guard service said its officers returned fire and forced the Russian group to retreat back into Russia. The area is largely rural and hasn’t seen intense fighting in more than a month. There was no immediate word from Russia.

Russia troops have also continued air and artillery strikes around the Azovstal steel plant in Mariupol, the last holdout of several hundred Ukrainian forces in the strategically important city, the Ukrainian General Staff said.

Britain’s Defense Ministry said Monday that Belarus was deploying special operations forces along its border with Ukraine and air defense, artillery and missile units to training ranges in the west of the country. Belarus’ forces have not been directly involved in the conflict, though its territory was used as a staging ground for the invasion.

But the presence of Belarusian troops near the border may keep Ukrainian troops pinned down there, preventing them from moving to support the counteroffensive in the Donbas.

Despite the fighting in the wider Kharkiv region and the threat of Russian missile attacks, many people were returning home to Kharkiv and other cities around Ukraine, Anna Malyar, deputy head of the Ministry of Defense, said.

Refugees were returning not just because of optimism that the war might ebb.

“Living somewhere just like that, not working, paying for housing, eating … they are forced to return for financial reasons,” Malyar said in remarks carried by the RBK-Ukraine news agency.