Ukrainian President Volodymyr Zelenskyy was welcomed Friday by Keir Starmer at the British prime minister's residence, 10 Downing Street.
The meeting took place before Zelenskyy was due to meet European leaders in London.
They have pledged military support to protect Ukraine from future Russian aggression if a ceasefire occurs.
Hosted by Starmer, the talks will focus on enhancing Ukraine's air defenses and supplying longer-range missiles.
The meeting aims to pressure Russian President Vladimir Putin, who has resisted peace negotiations.
Meanwhile, Russia's Defense Ministry reported downing 111 Ukrainian drones overnight. Ukrainian authorities said Russian artillery struck a residential block in Kherson, killing two people and injuring 11 others.

Associated Press US and World News Video
WGN Radio 720 News
7News Boston WHDH
The Columbian
Reuters US Top
AmoMama
Voice of Alexandria Sports
CNN
New York Post
CBS News Politics
Raw Story