Donald Trump says he has ordered two nuclear submarines to be positioned in the “appropriate regions” in a row with former Russian president Dmitry Medvedev.

It comes after Mr Medvedev, who is now deputy chairman of Russia‘s Security Council, told the US president on Thursday to remember Moscow had Soviet-era nuclear strike capabilities of last resort.

On Friday, Mr Trump wrote on social media: “Based on the highly provocative statements of the Former President of Russia, Dmitry Medvedev, who is now the Deputy Chairman of the Security Council of the Russian Federation, I have ordered two Nuclear Submarines to be positioned in the appropriate regions, just in case these foolish and inflammatory statements are more than just that.

“Words are very important, and can often lead to unintended consequences, I hope this will not be one of those instances. Thank you for your attention to this matter!”

The spat between Mr Trump and Mr Medvedev came after the US president warned Russia on Tuesday it had “10 days from today” to agree to a ceasefire in Ukraine or face tariffs, along with its oil buyers.

Moscow has shown no sign it will agree to Mr Trump’s demands.

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Mr Medvedev accused Mr Trump of engaging in a “game of ultimatums” and reminded him Russia possessed a Soviet-era automated nuclear retaliatory system – or “dead hand” – after Mr Trump told him to “watch his words” and said he’s “entering very dangerous territory!”

Mr Medvedev, a close ally of Russian President Vladimir Putin, was referring to a secretive semi-automated Soviet command system designed to launch Russia’s missiles if its leadership was taken out in a decapitating strike.

He added: “If some words from the former president of Russia trigger such a nervous reaction from the high-and-mighty president of the United States, then Russia is doing everything right and will continue to proceed along its own path.”

He also said “each new ultimatum is a threat and a step towards war” between Russia and the US.

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Donald Trump’s trade war has been difficult to keep up with, to put it mildly.

For all the threats and bluster of the US election campaign last year to the on-off implementation of trade tariffs – and more threats – since he returned to the White House in January, the president‘s protectionist agenda has been haphazard.

Trading partners, export-focused firms, customs agents and even his own trade team have had a lot on their plates as deadlines were imposed – and then retracted – and the tariff numbers tinkered.

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While the UK was the first country to secure a truce of sorts, described as a “deal”, the vast majority of nations have failed to secure any agreement.

Deal or no deal, no country is on better trading terms with the United States than it was when Trump 2.0 began.

Here, we examine what nations and blocs are on the hook for, and the potential consequences, as Mr Trump’s suspended “reciprocal” tariffs prepare to take effect. That will now not happen until 7 August.

Why was 1 August such an important date?

To understand the present day, we must first wind the clock back to early April.

Then, Mr Trump proudly showed off a board in the White House Rose Garden containing a list of countries and the tariffs they would immediately face in retaliation for the rates they impose on US-made goods. He called it “liberation day”.

The tariff numbers were big and financial markets took fright.

Just days later, the president announced a 90-day pause in those rates for all countries except China, to allow for negotiations.

The initial deadline of 9 July was then extended again to 1 August. Late on 31 July, Mr Trump signed the executive order but said that the tariff rates would not kick in for seven additional days to allow for the orders to be fully communicated.

Since April, only eight countries or trading blocs have agreed “deals” to limit the reciprocal tariffs and – in some cases – sectoral tariffs already in place.

Who has agreed a deal over the past 120 days?

The UK, Japan, Indonesia, the European Union and South Korea are among the eight to be facing lower rates than had been threatened back in April.

China has not really done a deal but it is no longer facing punitive tariffs above 100%.

Its decision to retaliate against US levies prompted a truce level to be agreed between the pair, pending further talks.

There’s a backlash against the EU over its deal, with many national leaders accusing the European Commission of giving in too easily. A broad 15% rate is to apply, down from the threatened 30%, while the bloc has also committed to US investment and to pay for US-produced natural gas.

Where does the UK stand?

We’ve already mentioned that the UK was the first to avert the worst of what was threatened.

While a 10% baseline tariff covers the vast majority of the goods we send to the US, aerospace products are exempt.

Our steel sector has not been subjected to Trump’s 50% tariffs and has been facing down a 25% rate. The government announced on Thursday that it would not apply under the terms of a quota system.

UK car exports were on a 25% rate until the end of June when the deal agreed in May took that down to 10% under a similar quota arrangement that exempts the first 100,000 cars from a levy.

Who has not done a deal?

Canada is among the big names facing a 35% baseline tariff rate. That is up from 25% and covers all goods not subject to a US-Mexico-Canada trade agreement that involves rules of origin.

America is its biggest export market and it has long been in Trump’s sights.

Mexico, another country deeply ingrained in the US supply chain, is facing a 30% rate but has been given an extra 90 days to secure a deal.

Brazil is facing a 50% rate. For India, it’s 25%.

What are the consequences?

This is where it all gets a bit woolly – for good reasons.

The trade war is unprecedented in scale, given the global nature of modern business.

It takes time for official statistics to catch up, especially when tariff rates chop and change so much.

Any duties on exports to the United States are a threat to company sales and economic growth alike – in both the US and the rest of the world. Many carmakers, for example, have refused to offer guidance on their outlooks for revenue and profits.

Apple warned on Thursday night that US tariffs would add $1.1bn of costs in the three months to September alone.

Barriers to business are never good but the International Monetary Fund earlier this week raised its forecast for global economic growth this year from 2.8% to 3%.

Some of that increase can be explained by the deals involving major economies, including Japan, the EU and UK.

US growth figures have been skewed by the rush to beat import tariffs.

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The big risk ahead?

It’s a self-inflicted wound.

The elephant in the room is inflation. Countries imposing duties on their imports force the recipient of those goods to foot the additional bill. Do the buyers swallow it or pass it on?

The latest US data contained strong evidence that tariff charges were now making their way down the country’s supply chains, threatening to squeeze American consumers in the months ahead.

It’s why the US central bank has been refusing demands from Mr Trump to cut interest rates. You don’t slow the pace of price rises by making borrowing costs cheaper.

A prolonged period of higher inflation would not go down well with US businesses or voters. It’s why financial markets have followed a recent trend known as TACO, helping stock markets remain at record levels.

The belief is that Trump always chickens out. He may have to back down if inflation takes off.

It is “Liberation Day” III – the third tariff deadline set by Donald Trump.

From today, countries without bilateral trade agreements face reciprocal tariffs – ranging from 25% to 50% – with a baseline of 15% to 20% for any not making a deal.

He has delayed twice, from April to July and from July to August, but hammered this date home in his trademark caps-on style: “THE AUGUST FIRST DEADLINE STANDS STRONG, AND WILL NOT BE EXTENDED. A BIG DAY FOR AMERICA!!!”

“Will not be extended” for anyone but Mexico, it seems. The country secured a 90-day extension at the last minute, with Mr Trump citing the “complexities” of the border.

By close of business on the eve of deadline, he had a handful of framework deals – some significant – including the UK (10%), the EU, Japan and South Korea (15%), Indonesia and the Philippines (19%), Vietnam (20%).

On the EU agreement, which he struck in Scotland, the president said: “It’s a very powerful deal, it’s a big deal, it’s the biggest of all the deals.”

But what happened to the “90 deals in 90 days” touted by the White House earlier this year?

The short answer is they were replaced by letters of instruction to pay a tariff set by the US.

Amid of flurry of late activity, the US played hardball with major trading partners like Canada.

“For the rest of the world, we’re going to have things done by Friday,” said US Commerce Secretary Howard Lutnick – the “rest of the world” meaning everyone but China.

There is, apparently, the “framework of a deal” between the world’s two largest economies, but talks between Washington and Beijing are continuing.

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In terms of wins, he can claim some significant deals and point to his tariffs having generated an impressive $27bn (£20.4bn) in June, not bad for a single month.

But the legality of the approach is under siege – with the US Court of International Trade ruling that the “Liberation Day” tariffs exceeded the president’s authority, with enforcement paused pending appeal.

The deadline has stirred the pot, forcing a handful of deals onto the table. Whether they stick or survive legal scrutiny is far from settled.

But the playbook remains the same – threaten the world with trade chaos, whittle it down, celebrate the wins, and pray no one checks what’s legal.