Sunday morning UK news briefing: Today's top headlines from The Telegraph

1. Boris Johnson imposes steel tariffs to win back Red Wall

Boris Johnson will risk fresh allegations that he is breaking international law this week as he imposes sweeping new steel tariffs as part of an effort to win back support in Red Wall seats.

The Prime Minister is preparing to hit several developing countries with new “safeguard” import limits designed to protect UK manufacturers from a “flood of cheap steel” from overseas. Read the full story.

2. West must not sell out Ukraine, says Liz Truss in swipe at Emmanuel Macron

Liz Truss has warned leaders including Emmanuel Macron that the West cannot “sell out Ukraine” for a “quick end” to the war, calling on G7 and Nato countries to commit more arms and funding to the country.

In a joint article for The Telegraph with Dmytro Kuleba, her Ukrainian counterpart, the Foreign Secretary said Vladimir Putin, the Russian president, will “only be serious about negotiations once the Ukrainian people have pushed his troops back”. Read the full story.

3. BBC staff told there are more than 150 genders and urged to develop ‘trans brand’

BBC staff have been told there are more than 150 genders, and to develop their “trans brand” by declaring their pronouns on email signoffs.

The Telegraph has obtained material provided to radio staff by Global Butterflies, a transgender group that the BBC drafted in for training sessions last summer and autumn. Read the full story.

4. Smart meter rollout plunged into crisis in fresh blow for net zero

The smart meter rollout is facing a fresh crisis as a shortage of microchips leaves energy companies unable to meet their installation targets and facing multi-million pound fines.

Global shipping chaos and fierce competition from other electronics companies has led to a severe lack of critical parts for the devices, which track households' energy usage in real time and send this data to suppliers. Read the full story.

5. Chelsea offered chance to sign Manchester United's Cristiano Ronaldo

Chelsea have been offered the chance to sign Cristiano Ronaldo. Talks are understood to have taken place with Ronaldo’s agent Jorge Mendes although Manchester United expect the 37-year-old to stay at Old Trafford.

There have been suggestions in the last few weeks that Ronaldo is unsettled at United despite new manager Erik ten Hag making it clear he wants the forward to stay and will build his attack around him. Read the full story.