US think tanks and risk firms are placing Pakistan as among their number one security concerns for 2011.
In a survey of 65 leading terrorism experts by the journal Foreign Policy, nearly 80 per cent believed Pakistan posed the greatest threat to the West at this time.
Yemen comes in a distant second, at 12 per cent.
Security analyst Bill Roggio said: "The US government has become frustrated with Pakistan's intransigence with terrorist groups.
Several threats directed at the West were discovered to have been hatched in North Waziristan, including the massive Mumbai-styled plot directed against Europe."
Pakistan also figures in the New York-based Eurasia Group's report on the Top Risks for 2011.
The report said, "The risk in the subcontinent this year isn't AfPak. It's Pak-Pak. Pakistan is experiencing a near perfect storm of political, economic and social crises all rising in the absence of an effective central government."
That was in line with "plausible contingencies" for 2011 outlined by the Council on Foreign Relations' Center for Preventive Action. Several of its Tier I contingencies - those that pose "immediate or direct spillover threats to the US homeland" - several are related to Pakistan.