After the Congress slammed Prime Minister Narendra Modi over India's failed bid to join the Nuclear Suppliers Group (NSG), party Vice President Rahul Gandhi, who is abroad, took to Twitter to hit out at the government's “failed diplomacy”."NSG: How to lose a negotiation by Narendra Modi #FailedModiDiplomacy," Gandhi wrote on his official Twitter account.India's bid for membership of the NSG was unsuccessful after China stalled its move at a NSG meeting in Seoul on the grounds that New Delhi has not signed the Nuclear Non-Proliferation Treaty (NPT).The Congress on Friday asserted that the BJP-led central government showed unnecessary desperation for the Nuclear Suppliers Group (NSG) membership that led to embarrassment to the country."Diplomacy is always done by wisdom and silence... It is an embarrassment for India to do what was not required. This kind of intense lobbying by Prime Minister Modi and his government, we can understand, should have been done for UN Security Council membership," senior Congress leader and Deputy Leader of Opposition in Rajya Sabha Anand Sharma said on Friday at the party headquarters here.