The phrase "attack on one's country" means someone or a group of people trying to harm or cause damage to the place where you live, the place you call home. Full definition
The president, who spoke at the White House before meeting with senior military commanders about a potential missile strike on Syria, called the F.B.I. raid a «disgraceful situation» and an «attack on our country in a true sense.» (nytimes.com)
Therefore, this makes nonsense of the attempt to link hosting ex-detainees with the likelihood of terrorist attacks on the country that accepts them. (ghanapoliticsonline.com)
By forcing internet service providers to pull the plug on Instagram, WhatsApp and Facebook, the government there hopes to stem the spread of hate speech and fake news it blames for attacks on the country's Muslim minority. (cnbc.com)