President Volodymyr Zelenskiy visited Britain on Wednesday to drum up aid, winning a pledge to train Ukrainian pilots on advanced NATO fighter jets, a big symbolic step up in Western military support.

London was his first stop on only his second trip abroad since Russia invaded Ukraine on Feb. 24. An EU diplomat said Zelenskiy would travel on to Brussels on Thursday, where the European Union is holding a summit.

“The United Kingdom was one of the first to come to Ukraine’s aid. And today I’m in London to personally thank the British people for their support and Prime Minister Rishi Sunak for his leadership,” Zelenskiy posted on social media, under a picture of himself and Sunak at Stansted Airport.

Zelenskiy was also due to meet King Charles III, address parliament and visit Ukrainian troops training in Britain.

“President Zelenskiy’s visit to the UK is a testament to his country’s courage, determination and fight, and a testament to the unbreakable friendship between our two countries,” Sunak said in a statement.

Sunak’s office announced additional sanctions on Russia, as well as plans to accelerate the supply of military equipment to Kyiv. For the first time, Ukraine’s air force and marines would now be included in the British training programme.

“The training will ensure pilots are able to fly sophisticated NATO-standard fighter jets in the future,” it said.

That appeared to signal a notable shift in Western support, as countries have so far held back from providing jets or other weapons capable of striking deep into Russia.

The statement gave no timeframe for the training, and British officials have said teaching pilots to fly British jets takes years. But the first commitment of its kind signals an endorsement of a long-term security relationship with Kyiv, and could pave the way for allies to send planes.

Last month, Britain was the first Western country to promise Kyiv advanced battle tanks. It offered just 14, but within two weeks the United States and European allies pledged scores, ending months of debate.

German Chancellor Olaf Scholz, who came under fierce criticism for perceived foot-dragging on approving tank deliveries, said arms supplies should be coordinated confidentially rather than announced by individual countries.

“What harms our unity is a public competition to outdo each other,” he told the Bundestag lower house of parliament, according to a manuscript of his speech.