What's happening around the world on Tuesday:

-- TOP STORIES --

+ Pro-Russian rebels seize more buildings in east Ukraine

+ Pistorius faces another round of court grilling

+ Syria regime recaptures historic Christian town

+ Hunt for missing MH370 turns to seabed

+ Boston marks year since marathon attack

KIEV/SLAVYANSK, Ukraine: Pro-Kremlin militants gain ground across the separatist east of Ukraine, prompting fresh fears that the ex-Soviet state is in danger of disintegration despite growing Western pressure on Russia to help de-escalate the crisis (UKRAINE-RUSSIA-POLITICS-CRISIS)

PRETORIA: Oscar Pistorius returns to the dock for another round of grilling a day after the prosecution accused him of feigning emotion to dodge tough questions about the death of his girlfriend Reeva Steenkamp. From 0730 GMT (SAFRICA-TRIAL-PISTORIUS)

DAMASCUS/BEIRUT: Monitoring after Syrian regime forces recapture the historic Christian town of Maalula amid a string of advances in the strategic Qalamun region bordering Lebanon (SYRIA-CONFLICT)

KUALA LUMPUR/SYDNEY: Full coverage of the hunt for missing Malaysia Airlines flight MH370 with attention turning to the remote Indian Ocean's seabed (MALAYSIA-CHINA-AUSTRALIA-AVIATION)

BOSTON: Boston marks the one-year anniversary since two bombs made of explosives-packed pressure cookers went off near the finish line of the city's famous marathon, killing three people and injuring 260 others. Many of the wounded lost limbs in the terror attack, blamed on two Chechen brothers. Ceremony in honor of the victims starts at 1500 GMT (US-ATTACKS-BOSTON-ANNIVERSARY)

-- OTHER AGENDA ITEMS --

ABUJA: Follow-up after a bomb attack blamed on Boko Haram Islamists at a crowded bus station near Abuja killed 71 people, the deadliest-ever attack in Nigeria's capital territory (NIGERIA-UNREST-BOMBING)

NEW YORK: Yahoo releases quarterly earnings expected to highlight progress of CEO Marissa Mayer's turnaround efforts and that could shed light on the finances of Chinese e-commerce giant Alibaba, in which it holds a key stake. At 2000 GMT (US-IT-INTERNET-EARNINGS-YAHOO)

KRUGERSDORP, South Africa: South African court begins delivering at 0700 GMT a verdict in a two-day hearing in the trial of attackers of Rwanda's former army general Faustin Kayumba Nyamwasa, an opponent of strongman Paul Kagame (SAFRICA-RWANDA-COURT-MILITARY)

LIVERPOOL, United Kingdom: Memorial service at 1345 GMT to mark the 25th anniversary of the Hillsborough stadium disaster in which 96 Liverpool football fans were crushed to death at an FA Cup semi-final (BRITAIN-DISASTER-FBL-ENG-LIVERPOOL-HILLSBOROUGH)

ALGIERS: Presidential hopeful Ali Benflis, the main rival to ailing incumbent Abdelaziz Bouteflika, who is seeking a fourth term in Thursday's presidential election, holds a news conference. 0930 GMT (ALGERIA-VOTE-OPPOSITION-BENFLIS)