claim jerusalem as their capi l capital. the current president of the united states leaving very little doubt about who he holds responsible for cyber attacks. the man you see right there, barack obama says he told vladimir putin to, quote, cut it out when the two men met at the g20 summit. the hacks stopped then, but the damage had had had already been done with hacked e-mails posted on wikileaks. security experts say russian effort to gather information they are still ongoing and they're urging other countries to shore up their cyber defenses before it's too late as cnn's brian todd reports for us. >> moscow says the hacking allegations against russia are groundless. vladimir putin's spokesman challenging america to prove them. but u.s. officials tell cnn the russian hacks continue around the clock, phishing attempts,