Downing Street says the move is "the biggest strengthening of the UK's nuclear posture in a generation".
More than 120 Labour MPs are backing plans to block cuts to disability and sickness-related benefits.
A strategy document says an "all-of-society effort" is required to make the UK more secure.
Lord Richard Hermer said that the government was determined to "lead on international law issues" globally.
The announcement comes ahead of a two-day Nato summit in the Netherlands.
Labour MPs' challenge over benefits cuts is perhaps the gravest crisis in the PM's time in office so far.
Labour's Natalie Fleet says she used to tell friends "I can't be an MP - I was a teenage parent".
It comes after what she called a "disgraceful attack" on an RAF base and as a protest took place in central London.
The foreign secretary says UK forces are on high alert in the region, as Israel-Iran attacks continue.
The foreign secretary says UK forces are on high alert in the region, as Israel-Iran attacks continue.
The Reform UK leader says money raised from the policy would go to the lowest-paid 10% of full-time workers.
It will target the worst-performing trusts in England - and report back by the end of the year.
Plans to cut energy bills by up to 25% for more than 7,000 UK businesses is announced alongside other plans to boost growth.
Europe braces for Trump's arrival at the Nato summit with difficult questions over Iran and defence, following the 5% defence spending target he's demanded of allies
Starmer maintains diplomacy is the answer but Trump has so far chosen a different path, our political editor writes.
Starmer maintains diplomacy is the answer but Trump has so far chosen a different path, our political editor writes.
Starmer maintains diplomacy is the answer but Trump has so far chosen a different path, our political editor writes.
The MP for Ilford North pledges to work "constructively" on technical aspects of the legislation.
The Lib Dems argue Britain needs to become "war-ready" to deal in an increasingly unpredictable world.
He made the comments after Kneecap member Liam Óg Ó hAnnaidh appeared in court on Wednesday.