But Crimea under Russian control, when Russian-Ukrainian relations are so inflamed, is producing a potentially dramatic security problem.
The White House said on Wednesday that U.S. President Donald Trump had a phone conversation with Turkish President Recep Tayyip Erdogan over the recent Kerch Strait incident.
Adrian Karatnycky of the Atlantic Council urges us to build up USA naval forces in the Black Sea, send anti-aircraft and anti-ship missiles to Ukraine, ratchet up sanctions on Russia, threaten to expel her from the SWIFT system of worldwide bank transactions, and pressure Europe to cancel the Russians' Nord Stream 2 and South Stream oil pipelines into Europe.
Recognition of a Ukrainian church that is not under Moscow's jurisdiction has been an increasingly fraught issue amid the high tensions over Russia's 2014 annexation of the Crimean Peninsula and its support of separatist rebels in eastern Ukraine.
President Petro Poroshenko said that the one-month period of martial law introduced this week in Ukraine wouldn't restrict travel, cash withdrawals or currency purchases by Ukrainians but Russians will face some constraints.
Ukraine's soldiers are practising repelling a Russian attempt to land on the coast.
Zakharova concluded that martial law "endangers predominantly Russian-speaking regions, where most people never supported the current authorities, as opinion polls show". The Russians then captured the ships and their 24-member crew. No matter what the status of the 2003 agreement or the force of Russia's asserted sovereignty over the Kerch Strait, under the UNCLOS, Ukraine has the right of "transit passage" including its warships, in peace and war. Russian Federation insisted that the vessels were violating its border while Ukraine says it was following worldwide maritime rules and that the ships were well in the global waters.
Ukrainian State Border Service Head Pyotr Tsigikal said earlier that security measures would be tightened at crossing points.
In a violent confrontation, Russian border guards fired on and captured three Ukrainian ships in the Black Sea.
Or was the provocateur Ukrainian President Petro Poroshenko?
How Redmond sent a NASA mission to Mars
In fact, these satellites transmitted InSight's first look at its surroundings nearly immediately after the probe safely landed. NASA will use radio telescopes in Green Bank, West Virginia and also in Germany to listen out for radio signals from InSight.
MS votes in Senate race marked by racial controversy
On Monday, several nooses were found at the MS capitol in Jackson in an apparent protest against the tone of the election. A separate video showed her talking about "liberal folks" and making it "just a little more difficult" for them to vote.
Met Eireann issue Orange weather warning for six counties
Travel has been disrupted by wet and windy weather, ahead of Storm Diana which is expected to bring severe gales to NI. Those warnings continue into Thursday for much of Wales, the South West, North West, and north-east Scotland.
For now, Ukrainian officials say, Russia's measures extend to simply limiting traffic in and out of the sea.
German Chancellor Angela Merkel said she thought there was no military solution to the crisis. The Kremlin said Poroshenko's request looked created to cause more tensions in the area.
The Sea of Azov became a virtual Russian lake, access to which was controlled by Russia, just as access to the Black Sea is controlled by Turkey.
An escalation could inflict great pain on eastern Ukraine.
Yet, both sides could gain from this.
US President Donald Trump has, in turn, canceled at short notice a preplanned meeting with President Vladimir Putin in Buenos Aires, at the G20 summit, because of the continued detention of the Ukrainian sailors and the Russian actions on November 25 (Interfax, November 29).
The Ukrainian president is urging North Atlantic Treaty Organisation to deploy naval ships to the Sea of Azov amid a standoff with Russian Federation.
US Secretary of State Mike Pompeo also condemned what he called the "aggressive Russian action".
The prospect of Nato warships heading to the Sea of Azov which is separated from the Black Sea by the Kerch Strait seems remote as it is shallow, access to it is controlled by Russian Federation, and the Kremlin would likely view any attempt by the Atlantic alliance to deploy there as a hostile act.