Frontiers

Everyone has the right to freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers.

A frosty east-west relationship led to a sort of brinkmanship where both NATO and Russia flew military aircraft close to the other side's frontiers or even deliberately made brief incursions into the other side's airspace, either to test air defence capabilities or as part of a pattern of intimidation or coercion.

Many causes produce war. There are ancient hatreds, turbulent frontiers, the "legacy of old forgotten, far-off things, and battles long ago." There are new-born fanaticisms. Convictions on the part of certain peoples that they have become the unique depositories of ultimate truth and right.

Ideas do not respect national frontiers, and this is especially so where language and other traditions are in common.

Then Dido thus, with downcast look sedate: / "Take courage, Trojans, and dismiss your fear. / My kingdom's newness and the stress of Fate / force me to guard far off the frontiers of my state."

If you like xenobiology or astrobiology, maybe read the document "Is defining life pointless? Operational definitions at the frontiers of Biology."

We are far from being so inspired with a Russophobia as to regard the time as at hand when the Russian Cossack and the English Sepoy shall knock their noses together while acting as sentinels upon their respective frontiers.

The ocean is one of the last frontiers on Earth. But the world's ever-growing need for minerals and metals is pushing humans to boldly go where no human has gone before and they're finding new life in the process.

They sailed to new frontiers.