Sometimes they lack valid travel papers, or their country refuses to take them back or has no representation in Israel. Sometimes language differences pose a problem.
A 2008 document, leaked by whistleblower Edward Snowden, says the British were concerned about Israel's stance on Iran. GCHQ also spied on Israeli diplomats, and defense firms.
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Yossi Wasserman used his position to get lavish perks, blackmail colleague, according to indictment.
Over the past few days, two principals have been challenged for either hosting or seeking to invite the activists for a lecture.
Some 42,500 flock to Israel's Hula Lake, where they pass through to Africa and go back to Europe every year.
Security & Aviation
In the second such incident in seven days, Syria confirmed Israel struck a military airport in Damascus, close to Bashar Assad's palace.
Snapchat Spectacles are a hit, especially compared to Google Glass. Guess what: Wearable cameras are back.
Did the Israeli public subconsciously commission the sculpture placed in Tel Aviv's Rabin Square, or was the project a lefty gimmick?
'I want to warn against high expectations,' says Russian deputy foreign minister.
Your guide to exhibits, tours and other attractions around Israel.
Shalit to start working as a banker, will most likely be working in trading division after undergoing training, reports Channel 10.