"The established rules of international conduct are repeatedly being flouted by major countries like Russia," Hunt was to say in Washington, in his first major policy speech since succeeding Boris Johnson in July.

"Such aggressive and malign behavior undermines the international order that keeps us safe," Hunt was to tell an audience at the US Institute of Peace, a nonpartisan think tank, according to excerpts provided by the Foreign Office.

"Of course we must engage with Moscow, but we must also be blunt: Russia's foreign policy under President Putin has made the world a more dangerous place."

London has blamed the March poisoning in southwestern England of former Russian double agent Sergei Skripal and his daughter Yulia -- using a Soviet-made nerve agent -- on Moscow, plunging the two countries into a diplomatic crisis.

A number of Western countries have punished Moscow by expelling Russian diplomats in a coordinated manner. Some have gone further, with other punitive measures.

Those come on top on sanctions already in place over Russia's annexation of Crimea or Moscow's interference in foreign elections, notably in the 2016 presidential vote in the United States.

Hunt, who is to meet on Wednesday with US Secretary of State Mike Pompeo, will ask London's allies to do more.

"Today, the United Kingdom asks its allies to go further by calling on the European Union to ensure its sanctions against Russia are comprehensive, and that we truly stand shoulder to shoulder with the US," Hunt will say, according to the excerpts.

"That means calling out and responding to transgressions with one voice whenever and wherever they occur, from the streets of Salisbury to the fate of Crimea."

The administration of US President Donald Trump has been firm with Moscow, regularly announcing new sanctions over the Skripal case, but that message is sometimes muddied by American leader's willingness to improve ties with Putin.

At his July summit with the Russian leader in Helsinki, Trump appeared to be rather conciliatory towards his counterpart, shortly after raising hackles at a NATO summit in Brussels with his contrarian stance.

That earned the president widespread criticism at home, even angering many in his own Republican Party.

- Red lines - 

For Hunt, NATO's "credibility" has taken a hit.

"Those who do not share our values need to know that there will always be a serious price to pay if red lines are crossed -- whether territorial incursions, the use of banned weapons or, increasingly, cyber attacks," he was to warn.

Hunt will also seek to carry a tough message to Europe on the subject of Brexit, warning that a no deal departure could threaten the continent's unity for a generation, according to his office.

"One of the biggest threats to European unity would be a chaotic no-deal Brexit," he was to say.

Hunt, who replaced Johnson last month amid discord over how London should handle Brexit, was to say Britain would manage -- "we have faced many greater challenges in our history" -- but the European Union would suffer a serious blow.

"The risk of a messy divorce... would be a fissure in relations between European allies that would take a generation to heal -- a geostrategic error for Europe at an extremely vulnerable time in our history," he was to say.

A deal on Britain's divorce from the bloc -- which both sides want to strike by late October, with an eye towards a formal separation on March 29, 2019 -- is still up in the air, with Brussels sticking to its red lines.

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