An image tweeted by the British ambassador to Ukraine Melinda Simmons in February, with the caption 'Really happy to welcome Prime Minister Boris Johnson to Ukraine'. Photo: Melinda Simmons / Twitter
An image tweeted by the British ambassador to Ukraine Melinda Simmons in February, with the caption 'Really happy to welcome Prime Minister Boris Johnson to Ukraine'. Photo: Melinda Simmons / Twitter

UK ambassador: Putin will strike Kyiv if Ukrainians drop their guard