Kremlin is still funding the left as well. And that brings up the difference from how it was during the Cold war.
Back then it was an ideological war, the west funded any anti-communist regime and organisation they could find, even if the regime was a despot who was killing people left and right and USSR did the same to all communist regimes and organizations, with just as disregard to what kind of regimes and groups those were. Now Russia is funding groups that cause dissent amongst their rivals. They are not attached to Le Pen or his party, they just saw some rabble rousers and know that funding them will weaken France and perhaps even EU if the populists actually gain control.