MOSCOW :Russian airline Aeroflot was forced to cancel more than 50 round-trip flights on Monday, disrupting travel across the world's biggest country, as two pro-Ukraine hacking groups claimed to have inflicted a crippling cyberattack. The Kremlin said the situation was worrying, and lawmakers described it as a wake-up call for Russia. Prosecutors confirmed the disruption at the national flag carrier was caused by a hack and opened a criminal investigation. Senior lawmaker Anton Gorelkin said