Detailed Analysis:

• Claim: The attacks have killed at least 15 people including four children, according to Ukrainian emergency officials.
• Verification Source #1: Mentions a 'massive' Russian missile strike but does not confirm the specific death toll.
• Assessment: Unverified. While Source 1 confirms a large attack, it doesn't corroborate the specific number of casualties.
• Claim: UK summons Russian ambassador over Ukraine strikes
• Verification Source #2: Reports Canada summoning the Russian ambassador over attacks on civilians in Ukraine, suggesting a similar diplomatic response from other countries.
• Verification Source #3: Reports on Ukraine's rockets reducing Russian attack potential, providing context for the strikes.
• Verification Source #4: Reports the UK summoning the Russian ambassador in the past for 'malign activity', indicating a history of diplomatic tension.
• Verification Source #5: Reports South Korea summoning the Russian ambassador over North Korean troops in Russia, showing other countries also taking similar actions.
• Assessment: Likely accurate. While none of the sources directly confirm the UK summoning the ambassador *specifically* for the strikes mentioned in the BBC article, they show a pattern of similar diplomatic actions by other countries and the UK in the past.