LONDON (Reuters) – Jailed Kremlin critic Alexei Navalny told Russians on Friday to protest against the war in Ukraine in Russian cities and across the world on March 6, and accused President Vladmir Putin of bringing shame on the Russian national flag and language. Navalny, Putin’s most prominent domestic opponent, told Russians in a post on his blog to shrug off fears of protesting against Russia’s invasion of Ukraine and to take to the squares of their cities even if they had already left Russia. “Show the world that Russians don’t want war. Come out in the squares of Berlin, New York, Amste…