Islamic radicalisation process has also affected on Chechen separatist movement's support abroad. In 2013, the Tsarnaev brothers launched a suicide attack in Boston in claim of jihad, accusing the United States for killing Muslims of Iraq, Afghanistan and Palestine, weakened sympathy for Chechen resistance from Russia globally and increased xenophobia against Chechens and Muslims in the United States. Rampant Islamic terrorism in Europe and the exclusive role of the Chechens on the Islamic State of Iraq and the Levant, most notably Abu Omar al-Shishani, also dragged Chechen separatist movement in jeopardy due to increasing anti-Islamic sentiment on the rise in Europe, even in some of the most Russophobic countries in Europe like Poland.