Her father had just won agreement from the Russians to cut back on the world's stockpiles of nuclear weapons.
And Barack Obama's eldest daughter was obviously keen to make her own statement on the issue - even if it was merely a fashion statement.
Just 48 hours after the U.S. President signed agreements with Russian president Dmitry Medvedev to reduce weapon stores, 11-year-old Malia Obama was spotted wearing not one, but two T-shirts with an anti-nuclear message.
She wore the tops emblazoned with the Campaign for Nuclear Disarmament's famous logo as her father prepared for three days of G8 talks in Italy.
First there was a grey T-shirt bearing the CND logo to visit the Colosseum in Rome with her mother Michelle and seven-year-old sister Sasha. Then during the visit she swapped it for a mottled white and grey top also bearing the logo.The symbol, designed for the CND in 1958, is now widely used to signify peace and is also an international sign for anti-war protesters.
Mr Obama spent two days in Moscow this week meeting president Dmitry Medvedev and prime minister and former president Vladimir Putin.
There the American and Russian leaders agreed a landmark deal to reduce their stockpiles of nuclear weapons.