By Andrius Sytas and Marek Strzelecki VILNIUS/WARSAW (Reuters) – European grid operators are ready to implement immediately a long-term plan to bring the Baltic states, which rely on the Russian grid, into the European Union system in the event Moscow cuts them off, three sources familiar with the matter told Reuters. Concern about depending on Russia for any form of energy has mounted across Europe because of reductions in Russian gas supplies to some countries following Moscow’s invasion of Ukraine. The Baltic states are nervous because Lithuania has clashed with Russia for blocking goods to…