In reversal, Trump arms Ukraine and threatens sanctions on countries that buy Russian oil

-Trump threatens secondary sanctions on Russia in 50 days

•         Says up to 17 Patriot batteries could be available 'very soon'
    

• Russian markets rise, suggesting relief over delay

KYIV/WASHINGTON, July 14 (Reuters) - U.S. President Donald Trump announced new weapons for Ukraine on Monday, and threatened sanctions on buyers of Russian exports unless Russia agrees a peace deal, a major policy shift brought on by frustration with Moscow's ongoing attacks on its neighbor.

But Trump's threat of sanctions came with a 50-day grace period, a move that was welcomed by investors in Russia where the rouble recovered from earlier losses and stock markets rose.