Future U.S. elections may very well face more Russian attempts to interfere with the outcome, the FBI and the National Security Agency warned on Monday.\u201cThey\u2019ll be back,\u201d said FBI director James Comey. \u201cThey\u2019ll be back in 2020. They may be back in 2018.\u201dComey made the comment during a congressional hearing on Russia\u2019s suspected efforts to meddle with last year\u2019s presidential election. Allegedly, cyberspies from the country hacked several high-profile Democratic groups and people, in an effort to tilt the outcome in President Donald Trump\u2019s favor.Although Russia has denied any involvement, the FBI expects the country to strike again.\u201cOne of the lessons they [Russia] may draw from this is they were successful,\u201d Comey said. \u201cBecause they introduced chaos and division and discord.\u201dNSA director Michael Rogers agreed: \u201cI fully expect them to continue this level of activity.\u201dBoth the FBI and NSA are working with their counterparts in Europe to help stop similar election-tampering efforts allegedly from Russia, Rogers said.France and Germany are two countries about to hold their own elections, he noted.\u201cDisinformation, fake news, attempts to release information to embarrass individuals. You\u2019re seeing that play out to some extent in European elections right now,\u201d Rogers said.Back in December, a German intelligence agency accused Russia of ramping up online propaganda and hacking efforts to influence politics in the country. \u00a0The tactics have included spear phishing email attempts against German political parties that appear to resemble those carried out by Russian cyberspies during the U.S. presidential campaign, the agency said.In February, Norway also said spear phishing attacks had targeted email accounts belonging to political officials in the country -- those, too, similar to tactics used by a suspected Russian hacking group.In response, some are urging NATO to fight back. \u201cRussia is clearly testing NATO and the West,\u201d U.K. Defense Secretary Michael Fallon said last month.In the U.S., lawmakers have launched investigations into Russia\u2019s suspected role in influencing last year\u2019s election.But cybersecurity experts say the country needs to seriously bolster its cyber defenses.The U.S. needs to stop being so \u201creactive\u201d to every cyberattack\u00a0and work on ways to punish offenders and protect private companies from intrusions, said Mark Kuhr, CTO at security firm Synack.\u201cThis secret cyberwar never used to be in the news, but now its leaked out every other week,\u201d he said. \u201cWe\u2019ve got to start deterring these attacks.\u201dStrike back with comments on our Facebook page.