Liz Truss is set to tell Nato foreign ministers that the “age of engagement with Russia is over”.
The UK foreign secretary will also declare that an agreement between Nato and Moscow, under which the two sides “do not consider each other as adversaries”, is dead.
Ms Truss will attend a working dinner with Nato ministers in Brussels on Wednesday, where she is expected to say the alliance must toughen its response and not allow security vacuums to emerge.
"We need a new approach to security in Europe based on resilience, defence and deterrence," she is expected to say, according to excerpts of her address released early.
"There is no time for false comfort. Russia is not retreating, but regrouping and repositioning to push harder in the east and south of Ukraine."
Ms Truss is expected to push the importance of continuing to arm Ukraine and toughening sanctions, as the UK announced more penalties on Wednesday.
Asset freezes have been imposed on Sberbank, Russia’s largest lender, and the Credit Bank of Moscow.
All new outward investment to Russia has been banned and the UK has also committed to end all imports of Russian coal and oil by the end of the year, with gas to follow as soon as possible.
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Nato foreign ministers meet in Brussels to discuss the latest in the continuing Russia-Ukraine war. AFP -
People take part in a protest against the transport of cargo to Russia and Belarus near the Polish-Belarusian border crossing in Koroszczyn, eastern Poland. EPA -
A Ukrainian naval vessel, thought to be the ‘Donbas’ and a nearby building burn in the besieged city of Mariupol. AP -
Bucha resident Tetiana Ustymenko weeps over the grave of her son, buried in the garden of her house, in Bucha, north-west of Kyiv. AFP -
People charge their mobile phones in a public building in Bucha. AFP -
People from Mariupol leave a train to be taken to temporary residences in Nizhny Novgorod, Russia. AP -
Vladyslava Liubarets, a Bucha resident, cries as she hugs her sister whom she had not seen since the beginning of the Russian invasion, in Bucha, the town which was retaken by the Ukrainian army. EPA -
Local citizen Oleksandr, 55, looks at the grave of his neighbour in the backyard of his private house in Hostomel in Kyiv. EPA -
Debris of a rocket missile on the field near Kyiv. EPA -
The mother of Ukrainian soldier Lubomyr Hudzeliak, who was killed during Russia's invasion of Ukraine, mourns during his funeral in the western Ukrainian city of Lviv. AFP -
A woman takes care of a baby at a shelter in the Ukrainian city of Severodonetsk in Donbas region. AFP -
Residents gather outside a shelter in the city of Severodonetsk. AFP -
Residents in eastern Ukraine, including the city of Severodonetsk in Donbas region, have been asked by their government to leave 'now' or 'risk death'. AFP -
A young girl with her dog arrives at a centre for the displaced in Zaporizhzhia, north-west of Mariupol. AFP -
A damaged ambulance in Hostomel, on the outskirts of Kyiv. Reuters -
A bomb crater left behind by Russia's attack on the Ukrainian village of Demydiv, on the outskirts of Kyiv. Reuters -
Russian attacks have reduced Hotel Ukraine in Chernihiv to debris. Reuters -
Oleksii Shcherbo, 98, near his burnt house in the village of Sloboda, on the outskirts of Chernihiv. Reuters -
Residents walk past destroyed Russian military machinery on the street, in Bucha, the town which was retaken by the Ukrainian army, north-west of Kyiv. EPA -
Damaged National flags flutter in the wind on a cemetry of Chernihiv city which was blocked by Russian troops for a long time. EPA -
Demonstrators lie down on the ground in tribute to the people killed in Russia's war against Ukraine, in Berlin, Germany. AP -
A Ukrainian firefighter works at the site of a burning fuel storage facility ignited by an air strike, in Dnipropetrovsk. Reuters -
A woman before and after she was removed by rescuers from debris after a military strike on the town of Rubizhne, Luhansk. Reuters -
People wait for help to evacuate Derhachi. Reuters -
Pope Francis, in Vatican, holds a Ukrainian flag given to him by a delegation from the town of Bucha, where dozens of bodies had been found. EPA -
State emergency servicemen clear shells near Chernigiv, northern Ukraine. AFP -
US war veteran Steven Straub shows his tattoo of the Ukrainian flag while on patrol near Buda-Babynetska, north of Kyiv, days after Russian forces retreated from the area. AFP -
Candles are arranged in the shape of Ukraine by the monument to the poet Taras Shevchenko in the western city Lviv. AFP -
A teddy bear hangs from a tree branch outside an apartment building in Borodyanka, Kyiv oblast. AP -
A woman carries her cat as she walks past buildings that were destroyed by Russian shelling, in Borodyanka. Reuters -
Dmitriy Evtushkov, 25, points to his picture in a primary school album retrieved from the rubble of a block of flats. AP -
Technicians try to fix the internet in Bucha. AP -
A smashed mobile phone lies next to a Russian army ration book in Bucha. AP -
A woman and children after their arrival at a centre for displaced persons in Zaporizhzhia, about 200 kilometres north-west of Mariupol. AFP -
A man leaves a damaged pharmacy after a bombing that killed several civilians, in Mykolaiv. AP -
Ukrainian soldiers sing a patriotic song with buildings in the background that were destroyed during fighting in Borodyanka. AP -
Borodyanka residents carry humanitarian aid packages. Reuters -
Elderly Ukrainians shelter in a basement in Kharkiv, in eastern Ukraine. EPA -
Destroyed apartment buildings in Borodyanka. Reuters -
Relatives and friends are overwhelmed with emotions as they stand next to the coffin of Anatoly German during his funeral. AP
Imports of Russian iron and steel products will be banned and another eight oligarchs have been added to the sanctions list.
Ms Truss said they are “some of our toughest sanctions yet”.
At the Nato meeting, she is expected to urge more support for countries such as Georgia, Moldova, Sweden and Finland.
Ms Truss is also expected to say the Nato-Russia Founding Act, in which it was declared the two sides “do not consider each other as adversaries”, is dead.
The agreement, signed in 1997, aimed to increase security and stability.
