As Russia’s ruthless war against Ukraine has faced major setbacks since it began a year ago, the Kremlin has deployed new disinformation themes and tactics to weaken US support for Kyiv with help from conservative media stars and some Republicans in Congress, according to new studies and experts. Moscow’s disinformation messages have included widely debunked conspiracy theories about US bioweapon labs in Ukraine, and pet themes on the American right that portray the Russian president, Vladimir Putin, as an ally in backing traditional values, religion and family in the fight against “woke” ideas. Further, new studies from thinktanks that track...