Putin says U.S. and allies have ignored Russia's security demands, but that he's open to more talks

Russian President Vladimir Putin said Tuesday that the U.S. and its allies have ignored Russia's top security demands, but that Moscow is still open for more talks with the West on easing soaring tensions over Ukraine.

Putin argued that it's possible to negotiate an end to the standoff if interests of all parties, including Russia's security concerns, are taken into account.

He deplored the Western refusal to consider the Kremlin's demands for guarantees that NATO won't expand to Ukraine, won't deploy weapons near the Russian border and will roll back its forces from Eastern Europe.

The demands — rejected by NATO and the U.S. as nonstarters — come amid fears that Russia might invade Ukraine, fuelled by the buildup of an estimated 100,000 Russian troops near Ukraine's borders. Talks between Russia and the West have so far failed to yield any progress.

The Russian leader charged that the Western allies' refusal to heed the Russian demands violates their obligations on integrity of security for all nations and insisted that a solution could be found through more talks.

He warned that Ukraine's accession to NATO could lead to a situation where Ukrainian authorities launch a military action to reclaim control over Crimea or areas controlled by Russia-backed separatists in the country's east.

"Imagine that Ukraine becomes a NATO member and launches those military operations," Putin said. "Should we fight NATO then? Has anyone thought about it?"

Russia annexed Ukraine's Crimean Peninsula in 2014 following the ouster of the country's Moscow-friendly president, and later threw its weight behind rebels in Ukraine's eastern industrial heartland, triggering a conflict that has killed over 14,000.

Speaking after talks with Hungarian Prime Minister Victor Orban in the Kremlin, Putin emphasized that it's still possible to find a settlement that would take every party's concerns into account.

He said that French President Emmanuel Macron may soon visit Moscow as part of renewed diplomatic efforts following their call on Monday.

Orban, who has forged close ties with Putin, putting NATO-member Hungary in a unique position, stressed that no European leader wants a war in the region and voiced hope for a settlement.

The Hungarian leader has avoided taking a definitive stance on the buildup of Russian troops along Ukraine's borders and some of his opponents at home criticized his trip to Moscow as a betrayal of Hungary's interests and Western alliances.

In a bid to exert pressure on the West, Russian Foreign Minister Sergei Lavrov has sent letters to the U.S. and other Western counterparts to seek their explanations about past obligations signed by all members of the Organization for Security and Co-operation in Europe, a top trans-Atlantic security grouping.

Russia has argued that NATO's expansion eastward has hurt Russia's security, violating the principle of "indivisibility of security" endorsed by the OSCE in 1999 and 2010.