Nato has marked 75 years of collective defence across Europe and North America, with its top diplomats vowing to stay the course in Ukraine as better armed Russian troops assert control on the battlefield.

The anniversary comes as the now-32-nation alliance weighs a plan to provide more predictable longer-term military support to Ukraine.

Plagued by ammunition shortages, Ukraine this week lowered the military conscription age from 27 to 25 in an effort to replenish its depleted ranks and appealed for additional aid defences to counter increasing Russian ballistic missile attacks.

Nato secretary general Jens Stoltenberg, right, shakes hands with Ukraine’s foreign minister Dmytro Kuleba prior to a meeting of the Nato-Ukraine Council at Nato headquarters in Brussels
Nato secretary general Jens Stoltenberg, right, shakes hands with Ukraine’s foreign minister Dmytro Kuleba prior to a meeting of the Nato-Ukraine Council at Nato headquarters in Brussels (Geert Vanden Wijngaert/AP)

“I didn’t want to spoil the birthday party for Nato, but I felt compelled to deliver a sobering message on behalf of Ukrainians about the state of Russian air attacks on my country, destroying our energy system, our economy, killing civilians,” said Ukrainian foreign minister Dmytro Kuleba, who attended a meeting of the Nato-Ukraine Council.

Mr Kuleba thanked the allies for agreeing to begin identifying Patriot missile battery stocks that could be sent to Ukraine.

The Patriot “is the only system that effectively intercepts ballistic missiles”, he said.

US secretary of state Antony Blinken, speaking before meeting Mr Kuleba, said that “support for Ukraine, the determination of every country represented here at Nato, remains rock solid”.

“We will do everything we can, allies will do everything that they can, to ensure that Ukraine has what it needs to continue to deal with Russia’s ongoing aggression against Ukraine, aggression that is getting worse with every passing day,” he said.

“The fight that Ukraine has on its hands is not only Ukraine’s fight, it’s everyone’s fight because the aggression being committed by Russia is not only an aggression against Ukraine and its people, it’s an aggression against the very principles that lie at the heart of the international system,” Mr Blinken said.

Nato secretary general Jens Stoltenberg, left, adjusts a ribbon during a wreath-laying ceremony at Nato headquarters in Brussels
Nato secretary general Jens Stoltenberg adjusts a ribbon during a wreath-laying ceremony at Nato headquarters in Brussels (Virginia Mayo/AP)

The Ukraine meeting, which ran significantly beyond its scheduled time, was held after a ceremony to mark the day Nato’s founding treaty was signed: April 4 1949 in Washington.

A bigger celebration is planned when Nato leaders meet in Washington from July 9 to 11.

Hundreds of staff filled the vast air terminal-like space at the centre of Nato’s sprawling Brussels headquarters, while scores of others looked down from glassed walkways and stairways as Belgian and Dutch military bands played the Nato Hymn, the original Washington Treaty laid before them.

“I like the Washington Treaty. Not least because it is very short,” Nato secretary general Jens Stoltenberg said with a smile.

“Just 14 paragraphs over a few pages. Never has a single document with so few words meant so much to so many people. So much security. So much prosperity, and so much peace.”

Outside Brussels on Wednesday evening, US secretary of state Antony Blinken paid tribute “to the millions of soldiers, sailors, and aviators whose courage and willingness to put their lives on the line have given weight to our sacred commitment to defend one another”.

Mr Blinken said that even as foreign ministers mark more than seven decades of peace, “that security – together with the alliance’s core principles of democracy, liberty, and the rule of law – is once again being threatened by those who believe that might makes right… and who seek to redraw borders by force”.

From left, Poland’s foreign minister Radoslaw Sikorski, Bulgaria’s foreign minister Mariya Gabriel, British Foreign Secretary Lord David Cameron and Estonia’s foreign minister Margus Tsahkna attend a ceremony to mark the 75th anniversary of Nato at Nato headquarters in Brussels
From left, Poland’s foreign minister Radoslaw Sikorski, Bulgaria’s foreign minister Mariya Gabriel, British Foreign Secretary Lord David Cameron and Estonia’s foreign minister Margus Tsahkna attend a ceremony to mark the 75th anniversary of Nato at Nato headquarters in Brussels (Geert Vanden Wijngaert/AP)

Ukraine’s foreign minister Dmytro Kuleba also attended on Thursday, and his message was more direct.

“Only today, 20 Shahed drones were shot at the city of Kharkiv and four people have been killed,” he said, adding that rescuers trying to help victims in the area were also killed.

“It is impossible to comprehend why allies cannot find additional batteries to deliver them to the place where ballistic missiles are being fired every day,” Mr Kuleba said.

Sweden’s foreign minister, Tobias Billstrom, is taking part in the first ministerial-level meeting since his country became Nato’s 32nd ally last month.

Russia’s full-scale invasion of Ukraine in February 2022 drove Sweden and Finland into Nato’s arms.

“Nato represents the freedom to choose,” Finnish foreign minister Elina Valtonen said, reflecting on the way the Nordic neighbours recently joined.

“Democratic nations, free people chose to join. Unlike how Russia expands by aggression or by illegal annexation.”

The alliance’s ranks have almost tripled from its 12 founding members, but Finland and Sweden joined in record time to shelter under Nato’s collective security guarantee, after coming under pressure for compensation from populist leaders in Turkey and Hungary.

That promise – Article 5 of the Washington Treaty, which has been shipped to Brussels for the ceremony – stipulates that an attack on any one of their number must be met with a united response.

It has only ever been used once, after the al Qaida attacks on US soil in 2001.

“Nato was founded on a single, solemn promise: An attack on one ally is an attack on all,” Mr Stoltenberg said on the eve of the anniversary.

“From that foundation, we have built the most powerful and successful alliance in history.”

Among the more recent successes as it grew from the Cold War and after the Berlin Wall collapsed, Nato would count its 1999 air campaign against former Yugoslavia to end a bloody crackdown on separatist ethnic Albanians and its effort to avert near civil war in Macedonia in 2001.

At the other end of the scale lies the operation in Afghanistan.

Belgium’s premier and foreign minister Paul-Henri Spaak, seated centre, tests a new pen before signing the North Atlantic Pact in Washington DC on April 4 1949, flanked by Belgium’s ambassador to the US Baron Silvercruys, left, and John W Foley of the US State Department. Seated behind, from left, are Britain’s Ernest Bevin, Norway’s Halvard Lange, Luxembourg’s Joseph Bech, Iceland’s Bjarni Benediktsson, Denmark’s Gustav Rasmussen, U.S. President Harry S. Truman, U.S. Secretary of State Dean Acheson; Canada’s Lester Pearson, France’s Robert Schuman, Italy’s Count Carlo Spforza, Holland’s Dirk Stikker and Portugal’s Jose Caeiro Da Matta
Belgium’s premier and foreign minister Paul-Henri Spaak, seated centre, tests a new pen before signing the North Atlantic Pact in Washington DC on April 4 1949, flanked by Belgium’s ambassador to the US Baron Silvercruys, left, and John W Foley of the US State Department. Seated behind, from left, are Britain’s Ernest Bevin, Norway’s Halvard Lange, Luxembourg’s Joseph Bech, Iceland’s Bjarni Benediktsson, Denmark’s Gustav Rasmussen, US President Harry S Truman, US secretary of state Dean Acheson, Canada’s Lester Pearson, France’s Robert Schuman, Italy’s Count Carlo Spforza, the Netherlands’ Dirk Stikker and Portugal’s Jose Caeiro Da Matta (AP)

Nato took command of the security effort in 2003 and it became the longest, costliest and deadliest in alliance history.

It was marked by a chaotic retreat in August 2021, many of the successes over almost two decades abandoned.

Today, Ukraine also wants a seat at Nato’s table, but the alliance works on unanimity and there is no consensus on whether it should join.

Most allies oppose membership while war rages on anyway.

For now, Nato promises only that its door is open for Ukraine in the future.

Russian President Vladimir Putin said he launched the war, in part at least, because Nato was expanding closer to Russia’s borders.

Nato allies cannot agree on whether to arm Ukraine either.

As an organisation, the alliance only provides non-lethal support such as transport vehicles, fuel, combat rations, medical supplies and demining equipment.

Two military personnel walk by Nato banners prior to a wreath-laying ceremony at Nato headquarters in Brussels
Two military personnel walk past Nato banners prior to a wreath-laying ceremony at Nato headquarters in Brussels (Virginia Mayo/AP)

However, many members provide arms and ammunition bilaterally or in groups.

The bulk of Nato’s efforts since Russian troops began massing for the invasion has focused on reinforcing its own borders near Russia and Ukraine to dissuade Mr Putin from targeting any of the allies next.

Article 5 was given perhaps its toughest test during Donald Trump’s term as president of the United States – by far Nato’s most powerful member country.

Mr Trump suggested the US might not come to the defence of any Nato ally who declined to boost their own defence spending to at least 2% of gross domestic product, as they had agreed to do in 2014.

He has repeated the threat during election campaigning this year.

Nato predicts that 18 of its 32 members will reach that target this year, up from only three a decade ago.